config: Change N80xx default UI window to 3

For whatever reason, the bootloader defaults to 3 on N80xx,
not 2 like I9300.

This causes the bootloader window to sometimes appear briefly
in certain cases until the device is suspended/resumed once,
and causes major corruption with opensource HWC prior to first
suspend/resume.

Change-Id: Ic8a34c8cb5ba1e64412ef551e15e9600cebdb338