fix: 修复任务栏关机按钮右键菜单无法响应的问题

完善菜单项的点击接口，保证其能正确触发对应的菜单功能

Log:
Influence: 任务栏-时尚模式下右键菜单功能
Task: https://pms.uniontech.com/task-view-110311.html
Change-Id: Id8d7d767534543d15eda79f77012e21ccdb2527d

frame/window/systempluginwindow.cpp

@@ -239,6 +239,11 @@ const QString StretchPluginsItem::contextMenu() const
     return m_pluginInter->itemContextMenu(m_itemKey);
 }
 
+void StretchPluginsItem::invokedMenuItem(const QString &itemId, const bool checked)
+{
+    m_pluginInter->invokedMenuItem(m_itemKey, itemId, checked);
+}
+
 void StretchPluginsItem::mousePressEvent(QMouseEvent *e)
 {
     m_hover = false;

frame/window/systempluginwindow.h

@@ -80,6 +80,7 @@ protected:
     void mouseReleaseEvent(QMouseEvent *e) override;
 
     const QString contextMenu() const override;
+    void invokedMenuItem(const QString &itemId, const bool checked) override;
 
 private:
     void mouseClick();

plugins/shutdown/shutdownplugin.cpp

@@ -237,7 +237,7 @@ void ShutdownPlugin::invokedMenuItem(const QString &itemKey, const QString &menu
         .service("com.deepin.dde.ControlCenter")
         .interface("com.deepin.dde.ControlCenter")
         .path("/com/deepin/dde/ControlCenter")
-        .method(QString("ShowModule"))
+        .method(QString("ShowPage"))
         .arg(QString("power"))
         .call();
     } else if (menuId == "Lock") {