fix: tweak @zindex-badge for table fixed column

[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?)

🔗 Related issue link

close #20750
close #13930

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix Badge z-index higher than Table fixed columns.
🇨🇳 Chinese	修复 Badge 在 Table 固定列中穿透的问题。

☑️ 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 #20751 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20751   +/-   ##
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  Coverage   97.47%   97.47%           
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  Files         296      296           
  Lines        6879     6879           
  Branches     1911     1911           
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  Hits         6705     6705           
  Misses        174      174

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