Set the 'state' property for drafts synced from the remote.

Summary:
This way drafts created locally and remotely have the same
representation.

Fixes T343.

Test Plan:
Check that drafts created on the backend have the 'state' property
set.

Reviewers: kav-ya

Reviewed By: kav-ya

Maniphest Tasks: T343

Differential Revision: https://review.inboxapp.com/D855