fixed hang after creating configuration on connection

- config created on connection is displayed as admin (platform name) on the client management page
- added config creation time on the client management page

client/amnezia_application.cpp

@@ -330,6 +330,7 @@ void AmneziaApplication::initModels()
                    ServerCredentials credentials) {
                 m_serversModel->reloadContainerConfig();
                 m_clientManagementModel->appendClient(clientId, clientName, container, credentials);
+                emit m_configurator->clientModelUpdated();
             });
 }