[os] Change condition for downloading the dotfiles
[os] Change condition for downloading the dotfiles

This change removes the need for the dotfiles directory to be
a Git repository (with a specific `origin` remote) in order to
avoid the download part of the setup.

Cherry-picked from
https://github.com/alrra/dotfiles/commit/58e1a9dbc9a97b1cf7f9041506f92aa3c6a10db0

wingy3181/dotfiles,wingy3181/dotfiles,wingy3181/dotfiles