Fix an issue with recurrence rules being set improperly in transaction code

Summary: Fixes T11745. I just missed this while juggling some of the internal storage.

Test Plan: Created a new event with recurrence behavior.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11745

Differential Revision: https://secure.phabricator.com/D16684

src/applications/calendar/xaction/PhabricatorCalendarEventFrequencyTransaction.php

@@ -19,8 +19,7 @@ final class PhabricatorCalendarEventFrequencyTransaction
     $rrule = id(new PhutilCalendarRecurrenceRule())
       ->setFrequency($value);
 
-    $dict = $rrule->toDictionary();
-    $object->setRecurrenceRule($dict);
+    $object->setRecurrenceRule($rrule);
   }
 
   public function validateTransactions($object, array $xactions) {