zsh: use color shorthand escape sequences
zsh: use color shorthand escape sequences

Try to reduce the verbosity a bit. It's not super readable, but neither
was what was there before.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent