ODF allows text properties on hyperlinks directly, librevenge wants an
inner span instead.

Change-Id: I903045a688bf318e7ac7f8cac83bb4d537259969
Reviewed-on: https://gerrit.libreoffice.org/45161Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>