and drop the SvxChartTextOrientItem class, unused.

Change-Id: I99100837d1beb953450f57b2cda47d165df1620c
Reviewed-on: https://gerrit.libreoffice.org/34747Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>