Regression from commit 8c73b16f (DOCX
import: declare wpg as a supported feature, 2013-12-05), the problem was
that <wpg:graphicFrame> did not forward to to the relevant oox context,
and also Writer had no idea how to create a
com.sun.star.drawing.OLE2Shape. Fix the later by using the same service
name that's in use for the non-groupshape case.

Change-Id: Id3536854da7c1f01525bb38d801496ecebd4c161
Reviewed-on: https://gerrit.libreoffice.org/71505Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins