AntennaTracker: use new interactive accelcal

AntennaTracker/GCS_Mavlink.pde

@@ -533,7 +533,7 @@ void GCS_MAVLINK::handleMessage(mavlink_message_t* msg)
 #if !defined( __AVR_ATmega1280__ )
                 if (packet.param5 == 1) {
                     float trim_roll, trim_pitch;
-                    AP_InertialSensor_UserInteract_MAVLink interact(chan);
+                    AP_InertialSensor_UserInteract_MAVLink interact(this);
                     if(ins.calibrate_accel(&interact, trim_roll, trim_pitch)) {
                         // reset ahrs's trim to suggested values from calibration routine
                         ahrs.set_trim(Vector3f(trim_roll, trim_pitch, 0));