[hotfix] Response RFChain should always be 0
[hotfix] Response RFChain should always be 0

jvanmalder/ttn,jvanmalder/ttn,LoRaWanSoFa/ttn,LoRaWanSoFa/ttn,mgranberry/ttn,TheThingsNetwork/ttn,jvanmalder/ttn,TheThingsNetwork/ttn,mgranberry/ttn,mgranberry/ttn,TheThingsNetwork/ttn