Fix an incorrect autocorrect for Style/IfWithSemicolon

This PR fixes the following incorrect autocorrect for `Style/IfWithSemicolon`
when using multiple expressions in the `else` body:

```console
$ cat example.rb
if cond; foo else bar'arg'; baz end

$ bundle exec rubocop --only Style/IfWithSemicolon -a
```

## Before

It results in an autocorrection of the syntax error:

```ruby
cond ? foo : bar'arg'; baz
```

## After

No syntax errors:

```ruby
if cond
 foo else bar'arg'; baz end
```

changelog/fix_an_incorrect_autocorrect_for_style_if_with_semicolon_cop.md

@@ -0,0 +1 @@
+* [#13161](https://github.com/rubocop/rubocop/pull/13161): Fix incorrect autocorrect for `Style/IfWithSemicolon` when using multiple expressions in the `else` body. ([@koic][])

lib/rubocop/cop/style/if_with_semicolon.rb

@@ -30,11 +30,7 @@ def on_normal_if_unless(node)
           message = message(node)
 
           add_offense(node, message: message) do |corrector|
-            if node.if_branch&.begin_type?
-              corrector.replace(node.loc.begin, "\n")
-            else
-              corrector.replace(node, replacement(node))
-            end
+            autocorrect(corrector, node)
           end
         end
 
@@ -43,7 +39,7 @@ def on_normal_if_unless(node)
         def message(node)
           template = if node.if_branch&.begin_type?
                        MSG_NEWLINE
-                     elsif node.else_branch&.if_type?
+                     elsif node.else_branch&.if_type? || node.else_branch&.begin_type?
                        MSG_IF_ELSE
                      else
                        MSG_TERNARY
@@ -52,6 +48,14 @@ def message(node)
           format(template, expr: node.condition.source)
         end
 
+        def autocorrect(corrector, node)
+          if node.if_branch&.begin_type? || node.else_branch&.begin_type?
+            corrector.replace(node.loc.begin, "\n")
+          else
+            corrector.replace(node, replacement(node))
+          end
+        end
+
         def replacement(node)
           return correct_elsif(node) if node.else_branch&.if_type?
 

spec/rubocop/cop/style/if_with_semicolon_spec.rb

@@ -100,6 +100,18 @@
     RUBY
   end
 
+  it 'registers an offense when using multiple expressions in the `else` branch' do
+    expect_offense(<<~RUBY)
+      if cond; foo else bar'arg'; baz end
+      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Do not use `if cond;` - use `if/else` instead.
+    RUBY
+
+    expect_correction(<<~RUBY)
+      if cond
+       foo else bar'arg'; baz end
+    RUBY
+  end
+
   it 'can handle modifier conditionals' do
     expect_no_offenses(<<~RUBY)
       class Hash