sync: fix missing import for -q

Some refactors during review dropped this import when it was reworked,
but it's still needed when using the --quiet setting.

Change-Id: I6d9302ef5a056e52415ea63f35bad592b9dfa75d
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/303942


Reviewed-by: Raman Tenneti <rtenneti@google.com>
Tested-by: Mike Frysinger <vapier@google.com>