meta:git-remote: Add origin as fallback remote

In the rare case that no remote url containing `druckdev/dotfiles`
exists, this should still (try to) work.
This could be the case if I rename my username or the repo or in the
even rarer case that somebody forks this... Quite ambitious.

meta/git-remote

@@ -6,6 +6,7 @@ die() {
 }
 
 remote="$(git remote -v | grep -m1 "druckdev/dotfiles" | cut -f1)"
+: "${remote:=origin}"
 url="$(git remote get-url "$remote")"
 ! printf "$url" | grep -q '^git@' || die "Using ssh already.\n" 0