Update recurring event doesn't work

[mavishay]

Issue Summary

When creating recurring event and then trying to update it or delete it. the synced calendar doesn't get effected

Steps to Reproduce

1. Turn on the system
2. Create recurring event
3. See the created Syncit items.
4. Change the original event time or delete.
5. The Syncit items doesn't get updated.

This is due the reason I gave the created event same ID as the original event ID. and that can't be done on recurring events.