refactor: remove legacy battery reporting toggle path

src/helpers/CommonCLI.h

@@ -58,7 +58,7 @@ struct NodePrefs { // persisted to file
   uint32_t discovery_mod_timestamp;
   float adc_multiplier;
   char owner_info[120];
-  uint8_t battery_reporting_enabled; // boolean
+  uint8_t reserved_290; // reserved to preserve on-disk prefs layout
   uint8_t rx_boosted_gain; // power settings
   uint8_t path_hash_mode;   // which path mode to use when sending
   uint8_t loop_detect;