fix: 修复wd-button在自定义样式下，按下active时的尺寸问题 #304

[Creat55]

🤔 这个 PR 的性质是？(至少选择一个)

• [x] 日常 bug 修复
• [ ] 新特性提交
• [ ] 站点、文档改进
• [ ] 演示代码改进
• [ ] 组件样式/交互改进
• [ ] TypeScript 定义更新
• [ ] CI/CD 改进
• [ ] 包体积优化
• [ ] 性能优化
• [ ] 功能增强
• [ ] 国际化改进
• [ ] 代码重构
• [ ] 代码风格优化
• [ ] 测试用例
• [ ] 分支合并
• [ ] 其他改动（是关于什么的改动？）

🔗 相关 Issue

https://github.com/Moonofweisheng/wot-design-uni/issues/304

💡 需求背景和解决方案

不强制定义边框弧度，改为overflow: hidden;

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

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

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