Remove Channel Accuracy from Position settings

[Hunter275]

Fix #301

Removes Precision settings from Position config as its no longer in the protobufs

[Hunter275]

There doesn't seem to be a precision setting coming in from the radio into the deviceStore

It's been removed

web/src/core/stores/deviceStore.ts

Line 171 in 4d1227a

device.config.position = config.payloadVariant.value;