Don't show 'needs review' on DifferentialObjects

Summary:
This text is overly repetitive and is not super important. Keeps the other states. Also

- Easier to parse reviewers now
- Mobile is less janky

Test Plan:
reload my list of diffs

{F138756}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D8707