[media] via-camera: pass correct format settings to sensor

The code attempts to maintain a "user format" and a "sensor format",
but in this case it looks like a typo is passing the user format down
to the sensor.

This was preventing display of video at anything other than 640x480.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>