Subscript/Superscript also don't depend on args

Change-Id: Ie96876ae402d5497bf5a03bca54f63305ebd9914
Reviewed-on: https://gerrit.libreoffice.org/7676
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>