stow-files.sh: don't use bash brackets and...
stow-files.sh: don't use bash brackets and...

fix common issue with existing .zshrc file on first installs

Signed-off-by: Niklas Koep <342d5290239d9c5264c8f98185afedb99596601a@gmail.com>

nkoep/dotfiles,nkoep/dotfiles,nkoep/dotfiles