fix(ukui-control-center): fix screenlock button

Description: issue=IA4XFW 【次要】【锁屏】切换蒙古文，打开设置-锁屏，最下方相关设置按钮文字显示不全

Log: issue=IA4XFW 【次要】【锁屏】切换蒙古文，打开设置-锁屏，最下方相关设置按钮文字显示不全

libukcc/widgets/SettingWidget/pushbuttonwidget.cpp

@@ -21,7 +21,8 @@ void PushButtonWidget::init()
     m_iconLabel->setVisible(false);
     mainLayout = new QHBoxLayout(this);
     mainLayout->setContentsMargins(16, 0, 16, 0);
-    m_pushButton->setFixedWidth(100);
+    m_pushButton->setMinimumWidth(100);
+    m_pushButton->setMaximumWidth(200);
     mainLayout->addWidget(m_iconLabel);
     mainLayout->addWidget(m_settingName);
     mainLayout->addStretch();