sd::FuTemplate Highlighting tab's colors don't stick anymore.

Change-Id: Idb1701ddf1f7d47758a4ef8ebe6705ee6ff16c11
Reviewed-on: https://gerrit.libreoffice.org/35800Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>