[hm] Fix native IT+ trasmitters transmitting temperatures below 0C
[hm] Fix native IT+ trasmitters transmitting temperatures below 0C

dwright134/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,dwright134/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,kdakers80/HeaterMeter,kdakers80/HeaterMeter,kdakers80/HeaterMeter,kdakers80/HeaterMeter,dwright134/HeaterMeter,shmick/HeaterMeter,dwright134/HeaterMeter,dwright134/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,dwright134/HeaterMeter,kdakers80/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,kdakers80/HeaterMeter,CapnBry/HeaterMeter,shmick/HeaterMeter,CapnBry/HeaterMeter