style(collapse): style optimization

[zhangpaopao0609]

🤔 这个 PR 的性质是？

• 组件样式改进

🔗 相关 Issue

💡 需求背景和解决方案

组件【collapse 折叠面板】样式优化: Tencent/tdesign#152

📝 更新日志

• style(Collapse): 样式优化 组件【collapse 折叠面板】样式优化 tdesign#152

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[github-actions]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.17%. Comparing base (492d477) to head (371d1ea).
Report is 986 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1322      +/-   ##
===========================================
+ Coverage    57.94%   58.17%   +0.22%     
===========================================
  Files          407      412       +5     
  Lines        15371    15439      +68     
  Branches      2931     2917      -14     
===========================================
+ Hits          8907     8981      +74     
- Misses        6187     6188       +1     
+ Partials       277      270       -7     

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