[Bug Report] The uncertain state interaction order of multiple check boxes is wrong

### Element UI version
2.13.0

### OS/Browsers version
win 10/Google Chrome 79.0.3945.117

### Vue version
3.0.0-alpha.1

### Reproduction Link
https://codepen.io/pen/?&editable=true

### Steps to reproduce
Step 1:Mark the first two check boxes as selected, and then select all to minus (partially selected).

Step 2: click the minus sign status to select all operations.

### What is Expected?
Step 1:Mark the first two check boxes as selected, and then select all to minus (partially selected).

Step 2: click the minus sign status to cancel all the selected operations.

### What is actually happening?
Step 1:Mark the first two check boxes as selected, and then select all to minus (partially selected).

Step 2: click the minus sign status to select all operations.