Support potential_values

[WorldLanguages]

See https://github.com/ScratchAddons/ScratchAddons/wiki/The-addon-manifest-(addon.json)#declare-optionssettings-optional

[Hans5958]

This is weird. I already supported it by adding an if statement if someone set the type as the "select" value. I will test it again just in case.

[WorldLanguages]

Lol I forgot to say "in userscripts as well as userstyles" sorry