Revert "Force using local recurrence implementation because of bugs in...

Revert "Force using local recurrence implementation because of bugs in libkolab: https://issues.kolab.org/show_bug.cgi?id=3812"

This reverts commit c7466084.

plugins/calendar/drivers/kolab/kolab_calendar.php

@@ -477,13 +477,12 @@ class kolab_calendar
         }
       }
     }
-      /* Force using local recurrence implementation because of:
-         https://issues.kolab.org/show_bug.cgi?id=3812
-      // use libkolab to compute recurring events
-      if (class_exists('kolabcalendaring')) {
-          $recurrence = new kolab_date_recurrence($object);
-      }
-      else*/ {
+
+    // use libkolab to compute recurring events
+    if (class_exists('kolabcalendaring')) {
+        $recurrence = new kolab_date_recurrence($object);
+    }
+    else {
       // fallback to local recurrence implementation
       require_once($this->cal->home . '/lib/calendar_recurrence.php');
       $recurrence = new calendar_recurrence($this->cal, $event);