This patch enables shortening of links, that where send from XMPP.
The problem was, that in util.php common_current_user() is not
finding the user account from which is posted, so the service to
shorten is not known, so no shortening at all...
This patch cleans up the xmppdaemon a little bit and hard codes ur1.ca
as shortening service _if_ the user is not set. Ugly but working.