fix: [file-dialog] Can not change filter in filedialog.

[GongHeng2017]

Not clear the records of last filter.

Log: fix issue
Bug: https://pms.uniontech.com/bug-view-299607.html

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在initialized信号连接的lambda表达式中，d_func()->lastFilterGroup.clear();和d_func()->lastFilter.clear();的调用位置不正确，应该放在if语句的外部，以确保无论条件是否满足，都会执行清理操作。
• d_func()->lastFilterGroup.clear();和d_func()->lastFilter.clear();的调用应该放在if语句内部，以确保只有在条件满足时才执行清理操作。

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: GongHeng2017, max-lvs

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment