Fix the enableTrace XSLT used to enable trace level loggin in testsuite

This commit fixes the XSLT used to enable trace level logging of select packages during testsuite runs http://lists.jboss.org/pipermail/jboss-as7-dev/2012-May/005962.html

Of course, a long term solution would be to not rely on the namespace version of the logging subsystem in the xslt but I didn't spend too much time looking into XSLT documents to understand how to do it. I guess this should be fine for now.