R1:a48e6897a418

Remove obsolete setup check call to Maniphest "Can Edit <X>" field checks

Summary: Ref T13164. Missed this in D19581.

Test Plan:
- Forced setup checks to re-run by visiting {nav Config > Setup Issues} explicitly.
- Before patch: fatal on call to nonexistent method.
- After patch: setup issues.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13164

Differential Revision: https://secure.phabricator.com/D19593