SystemMonitor: Display connection status icons in Network tab

Author: https://github.com/sppmacd
Commit: 13773d3ced
Pull-request: https://github.com/SerenityOS/serenity/pull/9022
Reviewed-by: https://github.com/kleinesfilmroellchen

Userland/Applications/SystemMonitor/NetworkStatisticsWidget.h

@@ -25,4 +25,7 @@ private:
     RefPtr<GUI::JsonArrayModel> m_tcp_socket_model;
     RefPtr<GUI::JsonArrayModel> m_udp_socket_model;
     RefPtr<Core::Timer> m_update_timer;
+    RefPtr<Gfx::Bitmap> m_network_connected_bitmap;
+    RefPtr<Gfx::Bitmap> m_network_disconnected_bitmap;
+    RefPtr<Gfx::Bitmap> m_network_link_down_bitmap;
 };