If we're asked to sync a repo to branch-heads or tags,
make sure we fetch refs/branch-heads/* and refs/tags/* even if
--with-branch-heads or --with-tags was not passed.

Bug: 938160
Change-Id: I04de8e7762c83322692d9551d057ec803fd2ac9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1506420Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>