Correct the behavior of "bin/repository discover --repair"
Move the "don't look at the database" behavior the flag enables into the cache lookup. D8781 should have been slightly more aggressive and done this, it was just overlooked.
- Ran bin/repository discover --help and read the updated help text.
- Ran bin/repository discover --repair in a fully-discovered Git repository.
- Before: no effect.
- After: full rediscovery.
Maniphest Tasks: T13591
Differential Revision: https://secure.phabricator.com/D21513