gitfast: fix prompt
gitfast: fix prompt

Certain themes need the 'clean' mark, and some people like to have the
'dirty' one, just like the original git_promp_info().

We probably shouldn't be modifying that function, there's no other clean
way to achieve our own status information, so let's try to emulate the
original as much as possible.

Signed-off-by: Felipe Contreras <de77a8b9cd239b204c19c52ed62e48ab47243362@gmail.com>

tnb/oh-my-zsh,tnb/oh-my-zsh,tnb/oh-my-zsh,tnb/oh-my-zsh