Plane: added scaling for Q_TAILSIT_VFGAIN

this scales the vectoring in fixed wing flight to remove the impact of
surface speed scaling and add throttle scaling

ArduPlane/tailsitter.cpp

@@ -108,11 +108,13 @@ void QuadPlane::tailsitter_output(void)
 
             // in forward flight: set motor tilt servos and throttles using FW controller
             if (tailsitter.vectored_forward_gain > 0) {
+                // remove scaling from surface speed scaling and apply throttle scaling
+                const float scaler = plane.control_mode == &plane.mode_manual?1:(tilt_throttle_scaling() / plane.get_speed_scaler());
                 // thrust vectoring in fixed wing flight
                 float aileron = SRV_Channels::get_output_scaled(SRV_Channel::k_aileron);
                 float elevator = SRV_Channels::get_output_scaled(SRV_Channel::k_elevator);
-                tilt_left  = (elevator + aileron) * tailsitter.vectored_forward_gain;
-                tilt_right = (elevator - aileron) * tailsitter.vectored_forward_gain;
+                tilt_left  = (elevator + aileron) * tailsitter.vectored_forward_gain * scaler;
+                tilt_right = (elevator - aileron) * tailsitter.vectored_forward_gain * scaler;
             }
             SRV_Channels::set_output_scaled(SRV_Channel::k_tiltMotorLeft, tilt_left);
             SRV_Channels::set_output_scaled(SRV_Channel::k_tiltMotorRight, tilt_right);