monitoring: Use the groupsummary query for the service group summary view

refs #8241

modules/monitoring/library/Monitoring/DataView/Servicegroupsummary.php

@@ -5,11 +5,22 @@ namespace Icinga\Module\Monitoring\DataView;
 
 class Servicegroupsummary extends Groupsummary
 {
+    /**
+     * {@inheritdoc}
+     */
     public function getFilterColumns()
     {
         return array('servicegroup');
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public static function getQueryName()
+    {
+        return 'groupsummary';
+    }
+
     /**
      * {@inheritdoc}
      */