fix port mapping for the wr841n-nd-v9; thanks to sven.kalinowski
fix port mapping for the wr841n-nd-v9; thanks to sven.kalinowski

ffff-next/ffff-next,meskal/ffff-next,ffff-next/ffff-next,ffff-next/ffff-next,RedDog99/bielefeld,meskal/ffff-next,RedDog99/bielefeld,ffff-next/ffff-next,meskal/ffff-next,RedDog99/bielefeld