Fix the Update server type

Hi Nick,

The type we have here is not the extension type (module). This is the Update Servertype. And the given xml file (http://updates.ostraining.com/mod_osregister.xml) is a "Extension" Update Server.

Also a smal one at the update xml stream:
the <client>0</client> should be <client>site</client>

I don't know if you need to use <![CDATA[http://updates.ostraining.com/mod_osregister.xml]]>
For me the URL (without CDATA) is enough.

JC Tracker:
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_id=8103&tracker_item_id=33740