R1:d467a9e3378c

Modernize PonderQuestion with EditEngine

Summary: Just a small touch up to move this to edit engine.

Test Plan:
- Create a question
- Edit a question
- Close question
- Test NUX state

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17812