Table: fix remove nested data not re-render element

[Hazlank]

fix #14998

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[ziyoung]

In fact, Vue can detect the change of array. https://jsfiddle.net/tLzna7oy/.
https://vuejs.org/v2/api/index.html#vm-watch

you don’t need to do so to listen for Array mutations.

[Hazlank]

@ziyoung 是的，但是嵌套的数组或者对象并不能够触发外层的watch?只有在deep为true的时候，才会递归的把外层的watch添加进嵌套数据的dep里,这样嵌套数据在监听变动时触发dep.notify时才能够执行到外层的watch吧