test: display values in AssertionErrors

In test-module-relative-lookup, change assert.strictEqual()
calls so that values are displayed when an AssertionError occurs.

PR-URL: #20545
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

test/parallel/test-module-relative-lookup.js

@@ -6,10 +6,10 @@ const _module = require('module'); // avoid collision with global.module
 const lookupResults = _module._resolveLookupPaths('./lodash');
 let paths = lookupResults[1];
 
-assert.strictEqual(paths[0], '.',
-                   'Current directory gets highest priority for local modules');
+// Current directory gets highest priority for local modules
+assert.strictEqual(paths[0], '.');
 
 paths = _module._resolveLookupPaths('./lodash', null, true);
 
-assert.strictEqual(paths && paths[0], '.',
-                   'Current directory gets highest priority for local modules');
+// Current directory gets highest priority for local modules
+assert.strictEqual(paths && paths[0], '.');