bugfix: make sure CVWidgetMS gets initialized with correct numSliders

in CVCenter:*prAddWidget

Signed-off-by:  <st9fan@gmail.com>
(cherry picked from commit 5e6afc0a223d149c656734e29e0af0aa24e6670d)
Signed-off-by: Stefan Nussbaumer <st9fan@gmail.com>

Conflicts:
	CVCenter/extCV.sc