Handle the case when the native data is the outer element and the
replacement image is the inner one.

Change-Id: Ifc3c8b8bc8c0903562a4dab1f0bf15e9de5c98ac
Reviewed-on: https://gerrit.libreoffice.org/50812Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>