style: Fix Table header extra border of right column

[afc163]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
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• TypeScript definition update
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🔗 Related issue link

💡 Background and solution

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📝 Changelog

Language	Changelog
🇺🇸 English	Fix Table header extra border of right side column
🇨🇳 Chinese	修复 Table 固定列头最右侧的多余边框样式。

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

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• 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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[ant-design-bot]

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[codecov]

Codecov Report

Merging #25378 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #25378   +/-   ##
=======================================
  Coverage   99.50%   99.50%           
=======================================
  Files         368      368           
  Lines        7300     7300           
  Branches     1999     2048   +49     
=======================================
  Hits         7264     7264           
  Misses         36       36           

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