AP_HAL_SITL: pass ADSB home location not string

libraries/AP_HAL_SITL/SITL_State.cpp

@@ -188,7 +188,7 @@ void SITL_State::_fdm_input_step(void)
 
         if (_sitl->adsb_plane_count >= 0 &&
             adsb == nullptr) {
-            adsb = new SITL::ADSB(_sitl->state, _home_str);
+            adsb = new SITL::ADSB(_sitl->state, sitl_model->get_home());
         } else if (_sitl->adsb_plane_count == -1 &&
                    adsb != nullptr) {
             delete adsb;