qt: Remove on_toggleNetworkActiveButton_clicked from RPCConsole

There is no network toggle button (anymore?) in the RPC console.
Removes another warning (#9250).

src/qt/rpcconsole.cpp

@@ -1089,8 +1089,3 @@ void RPCConsole::setTabFocus(enum TabTypes tabType)
 {
     ui->tabWidget->setCurrentIndex(tabType);
 }
-
-void RPCConsole::on_toggleNetworkActiveButton_clicked()
-{
-    clientModel->setNetworkActive(!clientModel->getNetworkActive());
-}

src/qt/rpcconsole.h

@@ -62,8 +62,6 @@ protected:
 private Q_SLOTS:
     void on_lineEdit_returnPressed();
     void on_tabWidget_currentChanged(int index);
-    /** toggle network activity */
-    void on_toggleNetworkActiveButton_clicked();
     /** open the debug.log from the current datadir */
     void on_openDebugLogfileButton_clicked();
     /** change the time range of the network traffic graph */