fix: empty icon on task manager in some cases

[BLumia]

修复部分场景下可能导致错误识别 desktopId,导致任务栏图标被隐藏.

Log:

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 代码中存在多次重复调用 res.first().data(m_activeAppModel->roleNames().key("desktopId")).toString()，建议提取为变量以减少重复代码。
• DESKTOPFILEFACTORY::createById 方法被调用两次，一次是 amAPP，一次是 asbtractAPP，可能需要确认这两个参数是否正确。
• desktopfile->isValied().first 应该是 desktopfile->isValid().first，拼写错误可能会导致逻辑错误。
• desktopfile.isNull() 检查后直接调用 DESKTOPFILEFACTORY::createByWindow(window)，可能需要考虑 desktopfile.isNull() 为 true 时的处理逻辑。

是否建议立即修改:
是

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, tsic404

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