More HIG fixes in filter, svx

Change-Id: I74df6b8221b4bb18791ec81af266dd58571c4c8c
Reviewed-on: https://gerrit.libreoffice.org/12489
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>