fix: getPopupContainer of ConfigProvider not works on Modal

[zombieJ]

🤔 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?

getPopupContainer of ConfigProvider not works on Modal

💡 Solution

Update logic

📝 Changelog

Language	Changelog
🇺🇸 English	Fix getPopupContainer of ConfigProvider not works on Modal
🇨🇳 Chinese	修复 ConfigProvider 的 getPopupContainer 对 Modal 无效的问题

☑️ 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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[codecov]

Codecov Report

Merging #17132 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #17132      +/-   ##
==========================================
+ Coverage   95.95%   95.95%   +<.01%     
==========================================
  Files         263      263              
  Lines        7344     7346       +2     
  Branches     2037     2049      +12     
==========================================
+ Hits         7047     7049       +2     
  Misses        295      295              
  Partials        2        2

Impacted Files	Coverage Δ
components/modal/Modal.tsx	100% <100%> (ø)	⬆️

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