打开Modal时，背景还可以滚动

[houjiazong]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.4.7

Environment

系统：（macOS Catalina 版本 10.15.1） 浏览器：（Chrome 版本 78.0.3904.108（正式版本） （64 位））

Reproduction link

https://www.antdv.com/components/modal-cn/

Steps to reproduce

官方demo就可以复现

What is expected?

打开modal时应该禁止背景滚动，应该把body的overflow设置为hidden

What is actually happening?

没有任何的处理

[github-actions]

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