(bug 44961) 'Patch Set' no more part of comments

https://gerrit.wikimedia.org/r/#/c/50041 makes it so Gerrit no more
append 'Patchset #:' before a user comment.  This has been the case
since the last upgrade.

This patch restore the regex matching 'recheck' to the old behavior.

This reverts commits:
 960e79466b56f8b547b477864a80f98afd0b0082
 6fc5d865e4427b5baff78e56da75018d31db4d37.

Change-Id: I05001c920471ba33b94174702c8afd59f762e3e5