Plane: fixed auto ICE engine cut in QLAND final

ArduPlane/quadplane.cpp

@@ -759,6 +759,10 @@ void QuadPlane::control_loiter()
         float height_above_ground = plane.relative_ground_altitude(plane.g.rangefinder_landing);
         if (height_above_ground < land_final_alt && poscontrol.state < QPOS_LAND_FINAL) {
             poscontrol.state = QPOS_LAND_FINAL;
+            // cut IC engine if enabled
+            if (land_icengine_cut != 0) {
+                plane.g2.ice_control.engine_control(0, 0, 0);
+            }
         }
         float descent_rate = (poscontrol.state == QPOS_LAND_FINAL)? land_speed_cms:landing_descent_rate_cms(height_above_ground);
         pos_control->set_alt_target_from_climb_rate(-descent_rate, plane.G_Dt, true);