I18nTextDomainFixer: remove unnecessary variable initialization (#2513)

Initializing the variable here is unnecessary as its value is immediately overridden in the if/else below.

Author: rodrigoprimo

WordPress/Sniffs/Utils/I18nTextDomainFixerSniff.php

@@ -674,7 +674,6 @@ public function process_comments( $stackPtr ) {
 		$regex   = $this->plugin_header_regex;
 		$headers = $this->plugin_headers;
 		$type    = 'plugin';
-		$skip_to = $stackPtr;
 
 		$file = TextStrings::stripQuotes( $this->phpcsFile->getFileName() );
 		if ( 'STDIN' === $file ) {