Revert "Restrict access to branch release-R117 to LTS Refresher group."

This reverts commit 291acbd13dc0dc1166ca94c2ad5cdb77825c4287.

Reason for revert: LTS refresh temporarily halted

Change-Id: I1abab74ae085a498df3711e0c6cfc400e5c01651
Reviewed-on: https://cos-review.googlesource.com/c/All-Projects/+/148204
Reviewed-by: Chenglong Tang <chenglongtang@google.com>
Tested-by: Derek Taylor <ddtaylor@google.com>