fix: The top bar of the trash has become a separate window

[liyigang1]

Trash is not an empty event sent in a child thread, causing show to execute in the child thread

Log: The top bar of the trash has become a separate window
Bug: https://pms.uniontech.com/bug-view-263093.html

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在TrashDirIterator::hasNext()函数中，调用TrashHelper::instance()->trashNotEmpty()可能不会按预期工作，因为该函数是TrashHelper的私有成员函数。
• TrashHelper::trashNotEmpty()函数被添加，但未在类定义中声明为公共或保护成员函数，可能导致访问错误。
• TrashHelper::onTrashNotEmptyState()函数被重命名为trashNotEmpty()，但信号trashNotEmptyState()未在类定义中声明为公共成员函数，可能导致连接错误。
• connect函数在TrashHelper::initEvent中被使用，但没有提供连接的目标对象，这可能导致未定义行为。

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: liyigang1, max-lvs

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[liyigang1]

/merge