The custom OLED_OFF mode implemented on satisfaction75 is incompatible
with the OLED_TIMEOUT feature (the OLED_TIMEOUT code assumes that any
key or encoder action should turn the OLED display on, and does not
provide any way to disable that behavior). To keep the OLED_OFF mode
functioning as before while still having a working OLED idle timeout, a
custom implementation of the OLED idle timeout code is added.