monitoring: Use notifications default ordering when showing a contact

modules/monitoring/application/controllers/ShowController.php

@@ -166,7 +166,7 @@ class Monitoring_ShowController extends Controller
                 'notification_contact',
                 'notification_start_time',
                 'notification_state'
-            ))->order('notification_start_time');
+            ));
 
             $notifications->where('contact_object_id', $contact->contact_object_id);