fix: Save button is not enabled when proxy address changed after saving

[ArchieMeng]

Bug: https://pms.uniontech.com/bug-view-273365.html
Log: Save button is not enabled when proxy address changed after saving

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在SysProxyModule::initManualView函数中，新增的connect信号槽连接可能存在潜在的槽函数错误。应该检查proxyEdit->textEdit()是否确实拥有textChanged信号。
• 在SysProxyModule::initManualView函数中，新增的槽函数没有处理text为空的情况，可能会导致m_buttonTuple->setEnabled(true);在不需要时被触发。
• 在connect槽函数中，直接使用this指针作为槽函数的参数，可能会导致隐式转换为QObject *，这可能不是预期的行为，应该使用static_cast进行显式类型转换。
• m_ignoreList的textChanged信号与槽函数的连接方式与之前的代码风格不一致，建议统一信号槽的连接方式。
• m_ignoreList的信号槽连接没有处理text为空的情况，应该添加对空文本的检查。

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: ArchieMeng, xionglinlin

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[deepin-bot]

TAG Bot

New tag: 2.0.33
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #264

[ArchieMeng]

/merge