fix: remove duplicate showDescription.value

[weikee94]

🤔 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

• 重复的showDescription.value 检查

💡 需求背景和解决方案

• 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

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (develop@b4a9772). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff             @@
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  Coverage           ?   60.88%           
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  Files              ?      402           
  Lines              ?    13879           
  Branches           ?     2601           
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  Hits               ?     8450           
  Misses             ?     5191           
  Partials           ?      238           

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[github-actions]

[uyarn]

LGTM