Remove fan controls when disabled
Remove fan controls when disabled

- Issue MatterHackers/MCCentral#3393
Enable Fan option shows even when my printer does not have a fan

larsbrubaker/MatterControl,mmoening/MatterControl,unlimitedbacon/MatterControl,mmoening/MatterControl,jlewin/MatterControl,unlimitedbacon/MatterControl,unlimitedbacon/MatterControl,larsbrubaker/MatterControl,larsbrubaker/MatterControl,unlimitedbacon/MatterControl,jlewin/MatterControl,mmoening/MatterControl,jlewin/MatterControl,larsbrubaker/MatterControl,jlewin/MatterControl