fix(tabs): update classname and demo

[LeeJim]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

无

💡 需求背景和解决方案

原有类名不是规范的 BEM，因此本次改动将涉及 classname 的破坏性改动。

📝 更新日志

• fix(Tabs): 调整非 BEM 的类名，此变更属于破坏性变更

• 本条 PR 不需要纳入 Changelog

☑️ 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]

Size Change: +128 B (0%)

Total Size: 155 kB

Filename	Size	Change
./miniprogram_dist/common/utils.wxs	540 B	+148 B (+38%)	🚨
./miniprogram_dist/tabs/tabs.wxml	820 B	-20 B (-2%)

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