If we draw a black graphic handle manually, then it's possible to color
it later, this isn't easy if a bitmap is painted.

Change-Id: Ib4456fd5155862d52e3ffa79ee49c7bfd16fb742
Reviewed-on: https://gerrit.libreoffice.org/26860Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>