Revert "scripts/git.sh: as long as the directory is writable clone to that"

It's safer for a users system to go back the way it was.

I'll leave it up to the user to actually 'git clone' a valid tree before running this script

This reverts commit e5ae0d0e7486d282d27719f7b851f65e7ecf9d54.

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>