Windows: fix cm_ServerFindByUUID

opr_uuid_equal() returns non-zero if equal.

Reviewed-on: http://gerrit.openafs.org/10090
Reviewed-by: Mark Vitale <mvitale@sinenomine.net>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 1630ada4630a90aae64a63025f8e16dad1500490)

Change-Id: If1e3faa8970cc3d6ef76ed21d948b0ab964a9312
Reviewed-on: http://gerrit.openafs.org/10108
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>