Allow searching diffs by more status options

Summary:
This Fixes T5737. Apparently the functionality to search by different
statuses in differential was already there, but the options weren't
exposed in the frontend. I can't think of any reason why this should've
been the case, so I just added the other options.

Test Plan: Tested against some local diffs to match new query option.

Reviewers: joshuaspence, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T5737

Differential Revision: https://secure.phabricator.com/D10076