fix: can't display local file for DciIcon

[18202781743]

Using QUrl to check FileUrl instead of string match.

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[deepin-ci-robot]

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关键摘要:

• 在setName函数中，对QQmlFile::isLocalFile(name)的依赖替换了原来的name.indexOf(":/") >= 0的逻辑，需要确认新的逻辑是否正确处理了所有预期的输入。
• 添加了对name是否为base64数据或本地文件的检查，但是没有修改现有的错误处理或日志记录机制，可能会影响调试和错误追踪。

是否建议立即修改:

• 是，建议进行以下修改：
  • 确保QQmlFile::isLocalFile(name)的逻辑正确处理了所有预期的输入，包括空字符串或非法的文件路径。
  • 增加对name为base64数据时的错误处理和日志记录，以便于调试和追踪问题。
  • 考虑添加对name为其他格式时的处理逻辑，例如直接使用name作为图标名称，或者抛出异常/错误信息。

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This pull-request has been approved by: 18202781743, zccrs

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