V4L/DVB: gspca - zc3xx: Don't change the registers 7 and 8 for sensor pas202b

These registers seem to act on the JPEG compression whose control
is not implemented in the current driver.

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>