opening_brace rule bug fixes

[mildm8nnered]

Fix for #3712

In the example given for the defect

             class TestFile {
                   func problemFunction() {
                       #if DEBUG
                       #endif
                   }
                   func openingBraceViolation()
                   {
                       print("Brackets")
                   }
               }

The if in #endif was being matched by the regex. I added in a word boundary (\b), to make sure that if, guard and while are only matched if they start at a word boundary

[SwiftLintBot]

	7 Warnings
⚠️	This PR introduced a violation in NetNewsWire: /Mac/AppDelegate.swift:34:1: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
⚠️	This PR introduced a violation in Swift: /benchmark/single-source/CodableTest.swift:79:69: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
⚠️	This PR introduced a violation in Swift: /validation-test/IDE/crashers_fixed/010-swift-archetypebuilder-addrequirement.swift:2:6: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
⚠️	This PR introduced a violation in Swift: /validation-test/IDE/crashers_fixed/010-swift-archetypebuilder-addrequirement.swift:3:11: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
⚠️	This PR introduced a violation in Swift: /validation-test/IDE/crashers_fixed/087-swift-declcontext-getparentmodule.swift:2:12: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
⚠️	This PR introduced a violation in Swift: /validation-test/IDE/crashers_fixed/087-swift-declcontext-getparentmodule.swift:2:26: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
⚠️	This PR introduced a violation in Swift: /validation-test/IDE/crashers_fixed/087-swift-declcontext-getparentmodule.swift:2:34: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)

	28 Messages
📖	Linting Aerial with this PR took 0.25s vs 0.25s on main (0% slower)
📖	Linting Alamofire with this PR took 0.26s vs 0.26s on main (0% slower)
📖	Linting Brave with this PR took 1.49s vs 1.49s on main (0% slower)
📖	Linting DuckDuckGo with this PR took 0.63s vs 0.63s on main (0% slower)
📖	Linting Firefox with this PR took 1.35s vs 1.36s on main (0% faster)
📖	Linting Kickstarter with this PR took 1.78s vs 1.78s on main (0% slower)
📖	Linting Moya with this PR took 0.15s vs 0.15s on main (0% slower)
📖	Linting NetNewsWire with this PR took 0.64s vs 0.64s on main (0% slower)
📖	Linting Nimble with this PR took 0.16s vs 0.16s on main (0% slower)
📖	Linting PocketCasts with this PR took 1.3s vs 1.31s on main (0% faster)
📖	Linting Quick with this PR took 0.09s vs 0.11s on main (18% faster)
📖	Linting Realm with this PR took 8.56s vs 8.55s on main (0% slower)
📖	Linting SourceKitten with this PR took 0.13s vs 0.16s on main (18% faster)
📖	Linting Sourcery with this PR took 0.44s vs 0.46s on main (4% faster)
📖	Linting Swift with this PR took 1.11s vs 1.12s on main (0% faster)
📖	Linting VLC with this PR took 0.32s vs 0.32s on main (0% slower)
📖	Linting Wire with this PR took 1.73s vs 1.74s on main (0% faster)
📖	Linting WordPress with this PR took 2.25s vs 2.26s on main (0% faster)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/026-swift-mangle-mangler-mangletype.swift:2:15: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/026-swift-mangle-mangler-mangletype.swift:2:25: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/026-swift-mangle-mangler-mangletype.swift:2:32: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/026-swift-mangle-mangler-mangletype.swift:2:52: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/026-swift-mangle-mangler-mangletype.swift:2:59: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/026-swift-mangle-mangler-mangletype.swift:2:68: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/026-swift-mangle-mangler-mangletype.swift:2:6: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/049-swift-typechecker-resolvewitness.swift:2:11: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/049-swift-typechecker-resolvewitness.swift:2:20: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
📖	This PR fixed a violation in Swift: /validation-test/IDE/crashers_fixed/049-swift-typechecker-resolvewitness.swift:2:32: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)

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[SimplyDanny]

LGTM!