support for lora skip_hop_decrement flag

[matkam]

> uv run meshtastic --get lora
Connected to radio
lora.use_preset: True
lora.modem_preset: 4
lora.bandwidth: 250
lora.spread_factor: 11
lora.coding_rate: 5
lora.region: 1
lora.hop_limit: 7
lora.tx_enabled: True
lora.tx_power: 30
lora.sx126x_rx_boosted_gain: True
lora.config_ok_to_mqtt: True
lora.skip_hop_decrement: True
Completed getting preferences

Related to meshtastic/firmware#9102

[ianmcorvidae]

Since this is only protobuf changes, there's no need to create a PR here. Once changes are in a protobuf release, they can be integrated with this project as usual; for testing you can of course use ones generated yourself such as this.