Fixed wrong variable name.

The idea here is that if we start the script from /usr/lib/zope, we want to
put the test output in /var/lib/zope instead of /usr/lib/zope, to keep the
later clean.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4616 20353a03-c40f-0410-a6d1-a30d3c3de9de