when ride on the broom in multiplayer mode, other players cannot see the broom's movement

I tried to fixed this bug, see the forked repo: https://github.com/ZYFDroid/majobroom

(I use this mod in my friend's server so there are some unnecessary modification)

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使用扫把移动的时候其他玩家看不到移动
我从船的代码里弄了点过来解决了问题，具体看 https://github.com/ZYFDroid/majobroom
（我朋友的服务器再用这个mod，他对合成表做了一些修改，忽略就好）