Merge pull request #420: Remove Scalar_Clone.sh utility script on Mac

This utility script was originally added to the VFSForGit project in the early bulk commit microsoft/VFSForGit@785ccb4, as part of a trio of scripts to make it easier to mount, clone, and unmount a test repository in the `~/GVFSTest` directory.

In PR #216, though, the mount and unmount helper scripts were removed as no longer relevant to Scalar.

While the remaining script is still functional, its utility is limited as its restriction to a fixed `~/ScalarTest` directory makes less sense without the matching mount/unmount scripts, so we remove it here.