Prevent hiding the PhabricatorProjectDetailsProfileMenuItem

Summary: This probably isn't the best solution, however, it conveniently avoids the bug from T13033. It would probably be more user-friendly (but more difficult to implement) if we allowed either Project Details or Workboard to be hidden but not both.

Test Plan: Tested locally, indeed this prevents hiding the menu item.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18836