autotest: allow more time to loiter to ne in precision test

Tools/autotest/arducopter.py

@@ -2972,7 +2972,7 @@ class AutoTestCopter(AutoTest):
 #        print('r=%f p=%f y=%f' % (m.roll, m.pitch, m.yaw))
         return vector - x
 
-    def loiter_to_ne(self, x, y, z, timeout=30):
+    def loiter_to_ne(self, x, y, z, timeout=40):
         dest = rotmat.Vector3(x, y, z)
         tstart = self.get_sim_time()
         while True: