When a non-broadcasting revision is updated, put it in "Draft", not "Needs Review"

Summary: Depends on D19285. Ref T13110. When you update an "Abandoned + But, Never Promoted" revision or (in the future) a "Changes Planned + But, Never Promoted" revision, return it to the "Draft" state rather than promoting it.

Test Plan: Updated an "Abandoned + Draft" revision, saw it return to "Draft".

Maniphest Tasks: T13110

Differential Revision: https://secure.phabricator.com/D19286