style: fix Anchor horizontal direction style

[gooyoung]

[中文版模板 / Chinese template]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• TypeScript definition update
• Bundle size optimization
• Performance optimization
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🔗 Related issue link

💡 Background and solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix redundant border style when Anchor component is set to horizontal direction
🇨🇳 Chinese	修复 Anchor 组件设置为水平方向时多余的 border 样式

☑️ Self-Check before Merge

⚠️ Please check all items below before requesting a reviewing. ⚠️

• 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

[github-actions]

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (41c4386) 100.00% compared to head (e284556) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #41336   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          610       610           
  Lines        10454     10454           
  Branches      2852      2852           
=========================================
  Hits         10454     10454           

Impacted Files	Coverage Δ
components/anchor/style/index.ts	100.00% <ø> (ø)

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