So that we can adjust page offset when outputting to GDIMetaFiles

Change-Id: I1c28440a1ff62a879b6341748a6d3092f2bfda96
Reviewed-on: https://gerrit.libreoffice.org/66526
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>