fix: Unable to open control center

[robertkill]

The network panel cannot open the control center
Triggering requestCheckAccount when inserting or removing screens However, the constant transmission of the dbus signal as' ture 'resulted in an error in the network panel's judgment of the lock screen interface display status

pms: BUG-307587

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在emit lockService.Visible(model->visible());这行代码中，model->visible()的返回值被直接传递给lockService.Visible信号，这可能会导致信号发射的值与lockFrame->setVisible的值不一致，如果model->visible()的返回值是false，而lockFrame->setVisible期望的是true，则可能会出现界面显示不一致的问题。

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: robertkill, yixinshark

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