Use menu behavior when completing scope arguments
Use menu behavior when completing scope arguments

We allow to abbreviate scopes ("set g" means the same thing as "set
global") but that feature is a bit obscure.  Users might figure out the
menu completion behavior faster, so let's maybe use it here as well?

jkonecny12/kakoune,jkonecny12/kakoune,mawww/kakoune,mawww/kakoune,mawww/kakoune,jkonecny12/kakoune,jkonecny12/kakoune,mawww/kakoune