Instead of not using '-c' for '--current-branch' when using gitc, we
were only using '-c' when using gitc, so we still had the conflict with
the gitc option, and other users still couldn't use '-c'.
Test: repo init -u https://android.googlesource.com/platform/manifest; repo init -c
Test: repo gitc-init -u ... -b ... -c testing
Change-Id: I71e4950a49c281418249f0783c6a2ea34f0d3e2b
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/253795
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Dan Willemsen <dwillemsen@google.com>
93293ca47f