SITL_AirSim: moved NED position initialization

out of always false if -statement

libraries/SITL/SIM_AirSim.cpp

@@ -307,6 +307,8 @@ void AirSim::recv_fdm(const sitl_input& input)
     location.lng = state.gps.lon * 1.0e7;
     location.alt = state.gps.alt * 100.0f;
 
+    position = home.get_distance_NED(location);
+
     dcm.from_euler(state.pose.roll, state.pose.pitch, state.pose.yaw);
 
     if (last_timestamp) {
@@ -358,7 +360,6 @@ void AirSim::recv_fdm(const sitl_input& input)
                        degrees(gyro.z));
 
     Vector3f velocity_bf = dcm.transposed() * velocity_ef;
-    position = home.get_distance_NED(location);
 
 // @LoggerMessage: ASM2
 // @Description: More AirSim simulation data