That was a dead end anyway, trying to partly reimplement
SvFilterOptionsDialog ExportDialog, instead of implementing the
necessary bits to use that one which has everything.

Change-Id: Icde7422f2c2d7e26c07dfe921a4abda41e222b09
Reviewed-on: https://gerrit.libreoffice.org/42503Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Eike Rathke <erack@redhat.com>