issue #4118: set body update after physics step.

cocos/physics/CCPhysicsWorld.cpp

@@ -1015,12 +1015,11 @@ void PhysicsWorld::update(float delta)
     _updateTime += delta;
     if (++_updateRateCount >= _updateRate)
     {
+        _info->step(_updateTime * _speed);
         for (auto& body : _bodies)
         {
             body->update(_updateTime * _speed);
         }
-        
-        _info->step(_updateTime * _speed);
         _updateRateCount = 0;
         _updateTime = 0.0f;
     }