Implement code review suggestion

Author: rodrigoprimo

WordPress/Sniffs/WP/AlternativeFunctionsSniff.php

@@ -353,11 +353,8 @@ public function process_matched_token( $stackPtr, $group_name, $matched_content
 	 */
 	protected function is_local_data_stream( $clean_param_value ) {
 
-		$stripped = TextStrings::stripQuotes( $clean_param_value );
-
-		if ( strpos( $clean_param_value, '\\' ) === 0 ) {
-			$clean_param_value = substr( $clean_param_value, 1 );
-		}
+		$stripped          = TextStrings::stripQuotes( $clean_param_value );
+		$clean_param_value = ltrim( $clean_param_value, '\\' );
 
 		if ( isset( $this->allowed_local_streams[ $stripped ] )
 			|| isset( $this->allowed_local_stream_constants[ $clean_param_value ] )