and fix the sal_Int32() conversion operator in Color, which was
always returning 0

Change-Id: I0aefaedc34ee0a8bccd43238ccfe8196d2dd5c5c
Reviewed-on: https://gerrit.libreoffice.org/50051Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>