[FIX] jQS5 PDF export: disable dompdf built-in autoload + correct path to config (still there is something wrong with jQS5 and PDF export in trunk)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@50802 b456876b-0849-0410-b77d-98878d47e9d5