Distance in Environment Telemetry is not actually serialized into protobufs

[ndoo]

Hi @caveman99, I think despite the addition of ultrasonic distance sensing during #3678 , /src/serialization/MeshPacketSerializer.cpp and possibly the nRF version of this file would need the meshtastic_PortNum_TELEMETRY_APP section updated to actually put the distance out into transmitted protobufs.

[caveman99]

The actual protobuf has the data field, like intended in the original PR, the files you mention just serialize into the JSON export format and only carry a subset of the available data. Looks like nobody needed that data point on the JSON yet.