V4L/DVB (6038): Trivial: repair mixed parm descs in dvb-usb-init.c

Repair modinfo parameter descriptions for force_pid_filter_usage and
disable_rc_polling.

Signed-off-by: Michael Mauch <michael.mauch@gmx.de>
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>