fix order of mac setup script
fix order of mac setup script

Because we have custom zsh files, installing oh-my-zsh after would have
caused an issue due to the directory already existing. Fix this by
cloning oh-my-zsh before running dotfiles.

Also fix an issue where running the mac setup script would have added
zsh to available shells every time

mloberg/dotfiles,mloberg/dotfiles,mloberg/dotfiles