Don't save connection state when destructing the controller

This causes neochat to crash and is done automatically by the connections

BUG: 458353

src/controller.h

@@ -101,7 +101,6 @@ public:
 
 private:
     explicit Controller(QObject *parent = nullptr);
-    ~Controller() override;
 
     QPointer<Connection> m_connection;
     bool m_busy = false;