V4L/DVB (12224): gspca - m5602-s5k4aa: Remove erroneous register writes

A couple of erroneous register writes snuck in that made the image go haywire. Remove these.
Many thanks to Grégory Lardière for finding this out

Signed-off-by: Erik Andrén <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>