[Bug Report] The select component is placed in the dialog component. After the keyboard presses esc, the pop-up window disappears, but the select does not disappear

### Element UI version
2.15.5

### OS/Browsers version
mac ios

### Vue version
2.6.14

### Reproduction Link
https://codepen.io/equicy/pen/eYWxZNQ

### Steps to reproduce
```
1. 在dialog组件中放置select组件
2. 点击一个禁用的select选项
3. 键盘按下esc
4. 弹窗消失，select组件的下拉面板无法消失
```

### What is Expected?
弹窗消失，select组件的下拉面板也消失

### What is actually happening?
弹窗消失，select组件的下拉面板无法消失

Start with the CodePen reproduction link using Element UI 2.15.5 and Vue 2.6.14, and reproduce the interaction between the dialog and select components on iOS/macOS. Trace the ESC handling after clicking a disabled select option. Done means closing the dialog also removes the select dropdown panel.

Written by the indexing model from the issue text.