Changes

   bit2: bottom screen backlight off

   bit2: bottom screen backlight off

   bit3: bottom screen backlight on

   bit3: bottom screen backlight on

   bit4: top screen backlight off (does nothing on 2ds as the backlight is bottom only)

   bit4: top screen backlight off (does nothing on 2DS as the backlight is bottom only)

   bit5: top screen backlight on

   bit5: top screen backlight on (see above)

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