fix: Modal 24px bottom area not trigger mask click

[afc163]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

👻 What's the background?

close #17226

💡 Solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Modal 24px bottom area cannot trigger mask click event.
🇨🇳 Chinese	修复 Modal 底部 24px 像素遮罩区域无法触发关闭弹窗行为。

☑️ Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

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[hashplus]

这个修改导致modal中下拉列表无法点击

[yoyo837]

上demo来看看。

[hashplus]

上demo来看看。

https://codesandbox.io/s/great-gould-2txjj

<AutoComplete
  defaultValue="lucy"
  // 把下面注释删除，下拉列表就没法点选。如果不添加下面一行，下拉列表就不能跟随页面滚动。
  // getPopupContainer={() => document.querySelector(".ant-modal")}
>

这块getPopupContainer取其他元素就能避免这个问题了，只要不是.ant-modal