fix: insideBoxBorer color issue

[mhduiy]

adjust insideBoxBorer color

Issue: https://github.com/linuxdeepin/developer-center/issues/8342

[deepin-ci-robot]

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This pull-request has been approved by: mhduiy

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[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在blendColorAlpha函数中，DS.applet("org.deepin.ds.dde-appearance")的调用可能需要错误处理机制，以防止插件未安装或配置错误。
• blendColorAlpha函数的命名应该更具描述性，表明它用于处理颜色混合。
• property color的逻辑可能需要更详细的注释，特别是对于D.DTK.themeType和D.ApplicationHelper.DarkType的判断，以及blendColorAlpha函数的实现细节。
• 检查D.DTK.themeType和D.ApplicationHelper.DarkType的命名是否符合项目的命名规范，以及它们是否在所有相关代码中一致。

是否建议立即修改:

• 是