git-codereview: add [branchname] when on release branch

This behavior was changed by 2865802.

Change-Id: Ib5a254240d4e8a8254ce52929ed1ec2165d545e2
Reviewed-on: https://go-review.googlesource.com/24756
Reviewed-by: Chris Broadfoot <cbro@golang.org>
1 file changed