git-codereview: specify --no-track in TestPendingNoneBranch

This is a similar fix to CL 23969.

Change-Id: Ief0fefd25e471d314234bd939150db8a9af74447
Reviewed-on: https://go-review.googlesource.com/24000
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
1 file changed