[Bug Report] Upload组件，本地上传弹出后，点击外部遮罩部分，上传文件窗口消失，但是遮罩没有消失。
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- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.14
### OS/Browsers version
macOS12.6.3/chrome119版本
### Vue version
2.7.15
### Reproduction Link
https://codepen.io/pen
### Steps to reproduce
Upload组件，本地上传弹出后，点击外部遮罩部分，上传文件窗口消失，但是遮罩没有消失。
### What is Expected?
遮罩消失
### What is actually happening?
遮罩未消失
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