Plane: use throttle in for transition max comparison

ArduPlane/quadplane.cpp

@@ -1760,7 +1760,7 @@ void QuadPlane::update_transition(void)
                                                                       plane.nav_pitch_cd,
                                                                       0);
         // set throttle at either hover throttle or current throttle, whichever is higher, through the transition
-        attitude_control->set_throttle_out(MAX(motors->get_throttle_hover(),motors->get_throttle()), true, 0);
+        attitude_control->set_throttle_out(MAX(motors->get_throttle_hover(),attitude_control->get_throttle_in()), true, 0);
         break;
     }