fix: Modal combine Drawer cause overflow invalid

[shaodahong]

🤔 This is a ...

• New feature
• Bug fix
• Site / document update
• Component style update
• TypeScript definition update
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🔗 Related issue link

Fixes #19956
Fixes #20175

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	修复 Modal 和 Drawer 结合使用导致滚动失效
🇨🇳 Chinese	fix Modal combine Drawer cause overflow invalid

☑️ 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 #20242 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20242   +/-   ##
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  Coverage   97.81%   97.81%           
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  Files         286      286           
  Lines        7735     7735           
  Branches     2178     2164   -14     
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  Hits         7566     7566           
  Misses        169      169

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