do not add a GISAS instrument in each newly created document

GUI/Models/ApplicationModels.cpp

@@ -103,8 +103,6 @@ void ApplicationModels::resetModels()
     m_jobModel->clear();
 
     m_instrumentModel->clear();
-    auto instrument = m_instrumentModel->insertItem<GISASInstrumentItem>();
-    instrument->setItemName("GISAS");
 }
 
 //! Writes all model in file one by one