[MS-OLEDS] 2.2.5 EmbeddedObject actually has a last Presentation field,
and we didn't write it so far.

Luckily all the info can be extracted from the OLE2 container, so we can
roundtrip the OLE1 wrapper around OLE2 nicely.

Change-Id: I8d4922428dd5beeaae8b6cd4da0575db7014e4a2
Reviewed-on: https://gerrit.libreoffice.org/63667Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins