- Fix per-tag "Restrict addition of tag to threads in these forums" option being unexpectedly applied in some cases
- Fix behavior of per-tag "Restrict addition of tag to threads in these forums" option to correctly apply the "none" option and to deselect if forums being applied when unchecked
Adding some tags throws a 'tag is blacklisted' type error when trying to add the tags, but they are not blacklisted.