Actually enforce auth.lock-config


Actually enforce auth.lock-config

Summary: Forgot to post this after D20394. Fixes T7667.

Test Plan:

  • Edited some providers with the config locked and unlocked.
  • Opened the edit form with the config unlocked, locked the config, then saved, and got a sensible error:
    Screen Shot 2019-07-11 at 10.12.44 AM.png (352×1 px, 50 KB)

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T7667

Differential Revision: https://secure.phabricator.com/D20645