* Discard dotfiles when looking for fonts
So as not to pickup, among other things:
* macOS resource forks
* *nix hidden files (which may be stale fuse ghosts on Kindle)
* Update Kindle font blacklist
Up to FW 5.9.6
Basically blacklist anything non-LGC, requiring lab126's FT build, or FC tweaks.
One day we'll fix CRe instead, maybe.