Tools: Fix AIRSPEED_AUTOCAL test failure

The mission plan for this test causes a lot of overshoot when turning onto final approach with the result that there is still some lateral offset when passing the landing waypoint that is not a measure of estimator accuracy.

Tools/autotest/arduplane.py

@@ -1591,7 +1591,7 @@ class AutoTestPlane(AutoTest):
         m = self.mav.recv_match(type='AIRSPEED_AUTOCAL',
                                 blocking=True,
                                 timeout=5)
-        self.wait_waypoint(7, num_wp-1, timeout=500)
+        self.wait_waypoint(7, num_wp-1, max_dist=5, timeout=500)
         self.wait_disarmed(timeout=120)
 
     def deadreckoning_main(self, disable_airspeed_sensor=False):