[Bug Report] with tree components, multi box filter, select the parent node, can only choose to filter out of the current node?

### Element UI version
2.13.0

### OS/Browsers version
win10 / chrome 79.0.3945.88

### Vue version
2.6.10

### Reproduction Link
https://codepen.io/henrytsz/pen/OJPgpLd

### Steps to reproduce
After the tree filtering, the original selected nodes are only hidden, but they are still in the selected state.

### What is Expected?
After filtering, it should be deleted from data, and data should be the ones displayed on the interface

### What is actually happening?
data does not change, those that are selected and filtered still exist