fix(dialog): 关闭按钮默认在底部，24px白色图标

[irisSong]

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复
• 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
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 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

💡 需求背景和解决方案

☑️ 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
• fork仓库代码是否为最新避免文件冲突
• Files changed 没有 package.json lock 等无关文件

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.16%. Comparing base (31851c0) to head (5a9596a).
Report is 28 commits behind head on next.

❗ Current head 5a9596a differs from pull request most recent head 8b40cce. Consider uploading reports for the commit 8b40cce to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #2118      +/-   ##
==========================================
+ Coverage   86.14%   86.16%   +0.02%     
==========================================
  Files         215      215              
  Lines       22753    22789      +36     
  Branches     2488     2488              
==========================================
+ Hits        19601    19637      +36     
  Misses       3147     3147              
  Partials        5        5              

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