Fix remote LNA toggle bugs: correct register comparison, add missing implementations, wire up companion radio

getRxBoostedGain was returned true because both 0x94 (power saving) and
0x96 (boosted gain = 1) return true

examples/companion_radio/NodePrefs.h

@@ -28,4 +28,5 @@ struct NodePrefs {  // persisted to file
   uint8_t  gps_enabled;      // GPS enabled flag (0=disabled, 1=enabled)
   uint32_t gps_interval;     // GPS read interval in seconds
   uint8_t autoadd_config;    // bitmask for auto-add contacts config
+  uint8_t sx126x_rx_boosted_gain; // SX126x RX boosted gain mode (0=power saving, 1=boosted)
 };