Plane: always log tailsitter scalefactor

ArduPlane/quadplane.cpp

@@ -2943,7 +2943,7 @@ void QuadPlane::Log_Write_QControl_Tuning()
         target_climb_rate   : target_climb_rate_cms,
         climb_rate          : int16_t(inertial_nav.get_velocity_z()),
         throttle_mix        : attitude_control->get_throttle_mix(),
-        speed_scaler        : last_spd_scaler,
+        speed_scaler        : log_spd_scaler,
         transition_state    : static_cast<uint8_t>(transition_state)
     };
     plane.logger.WriteBlock(&pkt, sizeof(pkt));

ArduPlane/quadplane.h

@@ -515,7 +515,8 @@ private:
     } tailsitter;
 
     // tailsitter speed scaler
-    float last_spd_scaler = 1.0f;
+    float last_spd_scaler = 1.0f; // used to slew rate limiting with TAILSITTER_GSCL_ATT_THR option
+    float log_spd_scaler; // for QTUN log
 
     // the attitude view of the VTOL attitude controller
     AP_AHRS_View *ahrs_view;

ArduPlane/tailsitter.cpp

@@ -338,6 +338,9 @@ void QuadPlane::tailsitter_speed_scaling(void)
         }
     }
 
+    // record for QTUN log
+    log_spd_scaler = spd_scaler;
+
     const SRV_Channel::Aux_servo_function_t functions[] = {
         SRV_Channel::Aux_servo_function_t::k_aileron,
         SRV_Channel::Aux_servo_function_t::k_elevator,