fix(Progress): StrokeLinecap style

[ZN1996]

[中文版模板 / Chinese template]

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🔗 Related issue link

fix #46535

💡 Background and solution

问题描述：
当Process组件 type 属性为“line”时，设置其 strokeLinecap 属性为“butt”后，进度条样式显示不正确。

解决思路：
在代码中根据 strokeLinecap 属性的值来决定是否设置进度条的圆角半径。

📝 Changelog

Language	Changelog
🇺🇸 English	Fix strokeLinecap style
🇨🇳 Chinese	修复strokeLinecap属性对应样式

☑️ Self-Check before Merge

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[github-actions]

Visual Regression Report for PR #46551 Passed ✅

Target branch: master (5393d9c)

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Congrats! No visual-regression diff found

[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5393d9c) 100.00% compared to head (1458d88) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master    #46551   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          708       708           
  Lines        12120     12121    +1     
  Branches      3217      3218    +1     
=========================================
+ Hits         12120     12121    +1     

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