(stable) Make legacy revision statuses from "differential.query" have type "string" again
Ref T2543. The type on these got changed by accident, it should be "string" (crazy nonsense, compatible) not "int" (sensible, not compatible).
(New API uses sensible strings like "accepted" only.)
Test Plan: Called differential.query from web UI, saw "2" and similar statuses.
Reviewers: chad, jmeador, lvital
Reviewed By: jmeador, lvital
Maniphest Tasks: T2543
Differential Revision: https://secure.phabricator.com/D18493