Previously, Draw/Impress use the default size from the printer.
Now Draw uses the paper size (specified in page formatting).
Impress still uses the old method - not sure if this is correct
but printing handouts etc probably complicate print/paper size.

Change-Id: If90bae4ac59cd95dd50fcd8deb25fd900756193e
Reviewed-on: https://gerrit.libreoffice.org/9866Reviewed-by: Matúš Kukan <matus.kukan@collabora.com>
Tested-by: Matúš Kukan <matus.kukan@collabora.com>