it was pretty bad idea not to save it for rich-formatted cells
(tdf#92296) as there is more to cell format than just a font

Change-Id: I0e5e7d7187c69519bb8f4de2b627e385fccd3d46
Reviewed-on: https://gerrit.libreoffice.org/22762Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>