codereview: fix hg sync closing of CLs for subrepositories

The regexp for closing CLs that were sent by you but committed by
someone else only matched messages for the main repository,
because of the added &repo=... for subrepositories.

R=golang-dev, r
CC=golang-dev
https://codereview.appspot.com/14512045

Committer: Rob Pike <r@golang.org>