When voiding "Accept" reviews, also void "Reject" reviews

Summary: Ref T10967. This change is similar to D17566, but for rejects.

Test Plan:

• Create a revision as A, with reviewer B.
• Reject as B.
• Request review as A.
• Before patch: stuck in "rejected".
• After patch: transitions back to "needs review".

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10967

Differential Revision: https://secure.phabricator.com/D17568