disambiguate contexts for impress vs draw printer options pages

Change-Id: I1bb52c49b95beab3d9acceec73370e0be8da6f59
Reviewed-on: https://gerrit.libreoffice.org/40747Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>