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 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