monitoring: Select the host and service display_name column when viewing notifications for a contact

refs #7843

modules/monitoring/application/controllers/ShowController.php

@@ -165,7 +165,9 @@ class Monitoring_ShowController extends Controller
                 'notification_output',
                 'notification_contact',
                 'notification_start_time',
-                'notification_state'
+                'notification_state',
+                'host_display_name',
+                'service_display_name'
             ));
 
             $notifications->where('contact_object_id', $contact->contact_object_id);