ACPI / video: Change the default for video.use_native_backlight to 1

Now that we're hoping to have resolved all of the problems with
video.use_native_backlight=1, make that the default at last.

Link: http://marc.info/?l=linux-acpi&m=139716088401106&w=2


Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>