Utils/I18nTextDomainFixer: start using the PHPCSUtils FilePath utility

The `FilePath::getName()` method will strip quotes from the file name, as well as normalize the slashes to forward (*nix) slashes.

This allows for a minor simplication in the code and improves code readability.

Author: jrfnl

WordPress/Sniffs/Utils/I18nTextDomainFixerSniff.php

@@ -11,6 +11,7 @@
 
 use PHP_CodeSniffer\Util\Tokens;
 use PHPCSUtils\BackCompat\Helper;
+use PHPCSUtils\Utils\FilePath;
 use PHPCSUtils\Utils\GetTokensAsString;
 use PHPCSUtils\Utils\PassedParameters;
 use PHPCSUtils\Utils\TextStrings;
@@ -675,7 +676,7 @@ public function process_comments( $stackPtr ) {
 		$headers = $this->plugin_headers;
 		$type    = 'plugin';
 
-		$file = TextStrings::stripQuotes( $this->phpcsFile->getFileName() );
+		$file = FilePath::getName( $this->phpcsFile );
 		if ( 'STDIN' === $file ) {
 			return;
 		}