[BUG] When authors are default selected visibility, you cannot unselect them

[danielBingham]

Describe the bug

Describe the bug you encountered. What happened? What did you expect to happen?

If you try to unselect author visibility is forces co-author visibility.

To Reproduce

Please describe the exact steps required to reproduce the bug.

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error