Mirroring settings should be hidden/grayed when mirroring is disabled
Summary
Mirroring settings are available even when mirroring is disabled.
Steps to reproduce
Disable mirroring in Admin > Settings > Repository > Repository mirror by unchecking "Allow mirrors to be set up for projects". Then go to a project's mirroring settings in Settings > Repository > Mirroring repositories and see that you still have the settings. If you submit a change, it seems mirroring won't actually work.