AC_AttitudeControl: update throttle rpy mix on every iteration

libraries/AC_AttitudeControl/AC_AttitudeControl.cpp

@@ -395,6 +395,9 @@ void AC_AttitudeControl::attitude_controller_run_quat(const Quaternion& att_targ
 
 void AC_AttitudeControl::rate_controller_run()
 {
+    // move throttle vs attitude mixing towards desired (called from here because this is conveniently called on every iteration)
+    update_throttle_rpy_mix();
+
     _motors.set_roll(rate_bf_to_motor_roll(_ang_vel_target_rads.x));
     _motors.set_pitch(rate_bf_to_motor_pitch(_ang_vel_target_rads.y));
     _motors.set_yaw(rate_bf_to_motor_yaw(_ang_vel_target_rads.z));