[Bug Report] Placing tabs inside a modal dialog causes CPU usage to spike to 100% when closing the dialog with destroy-on-close enabled

### Element UI version
2.13.2

### OS/Browsers version
Ubuntu 20.04, Chromium 85.0.4183.121/Firefox 80.0.1

### Vue version
2.6.12

### Reproduction Link
https://jsfiddle.net/swzvnj9a/2/

### Steps to reproduce
Create a el-dialog with destroy on close enabled.
Place an el-tabs tabs inside.
Close the dialog.
CPU usage is 100% ...

### What is Expected?
The dialog closes without hanging the browser.

### What is actually happening?
The dialog hangs the browser on close.