AP_ADSB: move variable into struct like the rest

libraries/AP_ADSB/AP_ADSB.cpp

@@ -547,7 +547,7 @@ void AP_ADSB::send_dynamic_out(const mavlink_channel_t chan)
     }
 
     uint16_t state = 0;
-    if (_is_in_auto_mode) {
+    if (out_state._is_in_auto_mode) {
         state |= UAVIONIX_ADSB_OUT_DYNAMIC_STATE_AUTOPILOT_ENABLED;
     }
     if (!out_state.is_flying) {

libraries/AP_ADSB/AP_ADSB.h

@@ -134,7 +134,6 @@ private:
 
     Location_Class  _my_loc;
 
-    bool _is_in_auto_mode;
 
     // ADSB-IN state. Maintains list of external vehicles
     struct {
@@ -159,6 +158,7 @@ private:
         uint32_t    chan_last_ms;
         UAVIONIX_ADSB_RF_HEALTH status;     // transceiver status
         bool        is_flying;
+        bool        _is_in_auto_mode;
 
         // ADSB-OUT configuration
         struct {