py: cam.py: Fix multi camera capture without -C

-C flag is supposed to affect only the camera that was previously
defined in the arguments. That's not the case, and, e.g.:

cam.py -c2 -C -c3

causes camera 3 to start capturing, but it stops after the initial
Requests have been completed.

Fix the issue by filtering out camera contexts that do not have -C
defined.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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