Prevent "Manage" profile menu items from being hidden
Summary: Ref T10054. Prevent users from removing this item and locking themselves out of the system unless they can guess the URI.
Test Plan: Tried to disable "Manage", wasn't permitted to.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10054
Differential Revision: https://secure.phabricator.com/D15113