Revert "monitoring: Clone the filter before modyfing it in the IdoQuery"

This reverts commit d8f866c2bc.

Master branch contains the fix w/ the proper refs.

modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php

@@ -479,12 +479,8 @@ abstract class IdoQuery extends DbQuery
         }
     }
 
-    /**
-     * {@inheritdoc}
-     */
     public function addFilter(Filter $filter)
     {
-        $filter = clone $filter;
         $this->requireFilterColumns($filter);
         return parent::addFilter($filter);
     }