Copter: integrate get_spline_yaw

ArduCopter/control_auto.pde

@@ -225,7 +225,7 @@ static void auto_spline_run()
         attitude_control.angle_ef_roll_pitch_rate_ef_yaw(wp_nav.get_roll(), wp_nav.get_pitch(), target_yaw_rate);
     }else{
         // roll, pitch from waypoint controller, yaw heading from auto_heading()
-        attitude_control.angle_ef_roll_pitch_yaw(wp_nav.get_roll(), wp_nav.get_pitch(), get_auto_heading(),true);
+        attitude_control.angle_ef_roll_pitch_yaw(wp_nav.get_roll(), wp_nav.get_pitch(), wp_nav.get_spline_yaw(),true);
     }
 }