FIX #11750 TIME 0:05 fix deprecated call on sort on filter elements

src/app/resource/controllers/ResourceListController.php

@@ -1243,7 +1243,7 @@ class ResourceListController
         ];
     }
 
-    private function compareSortOnLabel($a, $b)
+    private static function compareSortOnLabel($a, $b)
     {
         if (strtolower($a['label']) < strtolower($b['label'])) {
             return -1;