remove unused variable

Author: alterphp

src/Model/ListFilter.php

@@ -54,7 +54,6 @@ public static function getOperatorsList()
             static::$operatorValues = [];
             $refClass = new \ReflectionClass(static::class);
             $classConstants = $refClass->getConstants();
-            $className = $refClass->getShortName();
 
             $constantPrefix = 'OPERATOR_';
             foreach ($classConstants as $key => $val) {