PSR2/ClassDeclaration: remove some redundant code [1]

Issue squizlabs/PHP_CodeSniffer 2621 added the `T_COMMA` token to the `$ignoreTokens` (without adding a test) to prevent a false positive for a anonymous class declaration nested within a function call.
That fix was later superseded by another fix for basically the same issue via squizlabs/PHP_CodeSniffer#2678, which excluded anonymous classes completely from the `CloseBraceSameLine` check.

This commit adds the test case from squizlabs/PHP_CodeSniffer 2621 and removed the redundant `T_COMMA` token as the test now confirms it is no longer needed.

src/Standards/PSR2/Sniffs/Classes/ClassDeclarationSniff.php

@@ -525,7 +525,6 @@ public function processClose(File $phpcsFile, $stackPtr)
             $ignoreTokens[] = T_WHITESPACE;
             $ignoreTokens[] = T_COMMENT;
             $ignoreTokens[] = T_SEMICOLON;
-            $ignoreTokens[] = T_COMMA;
             $nextContent    = $phpcsFile->findNext($ignoreTokens, ($closeBrace + 1), null, true);
             if ($tokens[$nextContent]['content'] !== $phpcsFile->eolChar
                 && $tokens[$nextContent]['line'] === $tokens[$closeBrace]['line']

src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc

@@ -331,3 +331,10 @@ interface ClassBraceNotOnLineByItselfTrailingCommentIsAllowed
 trait ClassBraceNotOnLineByItselfTrailingAnnotationIsAllowed
 {
 } // phpcs:ignore Stnd.Cat.Sniff -- this comment is also allowed.
+
+// Issue squizlabs/PHP_CodeSniffer#2621 - fix was superseded by fix for #2678.
+$foo->bar(
+    new class implements Bar {
+        // ...
+    },
+);

src/Standards/PSR2/Tests/Classes/ClassDeclarationUnitTest.inc.fixed

@@ -320,3 +320,10 @@ interface ClassBraceNotOnLineByItselfTrailingCommentIsAllowed
 trait ClassBraceNotOnLineByItselfTrailingAnnotationIsAllowed
 {
 } // phpcs:ignore Stnd.Cat.Sniff -- this comment is also allowed.
+
+// Issue squizlabs/PHP_CodeSniffer#2621 - fix was superseded by fix for #2678.
+$foo->bar(
+    new class implements Bar {
+        // ...
+    },
+);