Creating a recurring event should save it as a recurring event.

Summary: Fixes T8551, Creating a recurring event should save it as a recurring event

Test Plan: Before patch: -create an event -flag as recurring -save -Result: event is not recurring -After patch Result: event saves as recurring.

Reviewers: Blessed Reviewers, epriestley

Reviewed By: Blessed Reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T8551

Differential Revision: https://secure.phabricator.com/D13302