[refactor] Fix handler access to recipient
[refactor] Fix handler access to recipient

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