Include "Draft" revisions in Differential legacy status queries
Use the actual complete map from DifferentialRevisionStatus instead of hard coding the status list so "Draft" is included.
- Ran differential.query with ids and status for a draft revision.
- Before patch: revision not returned in results.
- After patch: revision returned in results.
(Note that it returns as "Needs Review", for compatibility.)
Reviewed By: amckinley
Maniphest Tasks: T2543
Differential Revision: https://secure.phabricator.com/D18765