Sets the EPUBLayoutMethod filter data key at UNO level.

Change-Id: Ia07029bd83fec02e98cb6a3cc2bfea2ab742d769
Reviewed-on: https://gerrit.libreoffice.org/45644Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>