preferences.py: Remove commented import
preferences.py: Remove commented import

Not using `HotKeyItem` due to the length checking made in
1391f70d79144518dda9d0294a9e8a8fc79904ff.

teddywing/RoboFont-Equalize-Sidebearings-Key,teddywing/RoboFont-Equalize-Sidebearings-Key