Add hasBasketSupport for TimePeriods (#2543)

This adds the missing "hasBasketSupport" for TimePeriodController which
allows to add the TimePeriod to specific baskets.

Author: lippserd

application/controllers/TimeperiodController.php

@@ -30,4 +30,9 @@ public function rangesAction()
         $this->content()->add($form->handleRequest());
         IcingaTimePeriodRangeTable::load($object)->renderTo($this);
     }
+
+    protected function hasBasketSupport()
+    {
+        return true;
+    }
 }