Save .git_cl_description_backup in the working dir
Save .git_cl_description_backup in the working dir

Avoid cluttering the home directory by saving the CL description in
the project's working directory.

Bug: None
Change-Id: I42c78d03cd239e7c0453867f21fe4be57086722e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1925627
Commit-Queue: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>
Reviewed-by: Edward Lesmes <d05609f027dc667cc37492b1dc1bdea5d60fa82a@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools