fdo#65163 reintroduce embedded picture for form components

but not for report components (fdo#53001)

Change-Id: Ie07e1c2993304d4deb2124e72baa7a326b587918
Reviewed-on: https://gerrit.libreoffice.org/13303
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>