[utility] Some GNU aliases are not colours-related
[utility] Some GNU aliases are not colours-related

and they were mistakenly inside the Colours scope. Move them out of
there.

Still using the same `(( ${+commands[dircolors]} ))` test because it
works well with MacOS with coreutils installed without the `g` prefix,
for example.

joshuarubin/dotfiles,joshuarubin/dotfiles,Eriner/zim,joshuarubin/dotfiles,joshuarubin/dotfiles