Since the filter type has changed, we need to also update the filter
flags used in the unit tests.  And because the new filter no longer
relies on XSLT, we can drop the dependency on xslt.

Change-Id: I9dd040b3c8c0e95300c4dda1b87bf448a800097d
Reviewed-on: https://gerrit.libreoffice.org/49832Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>