Desktop: don't reload dive list model after clearing the model

By clearing the model, its contents are removed. There is no
point in reloading the model.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

desktop-widgets/mainwindow.cpp

@@ -691,7 +691,6 @@ void MainWindow::on_actionClose_triggered()
 		closeCurrentFile();
 		DivePictureModel::instance()->updateDivePictures();
 		setApplicationState(ApplicationState::Default);
-		recreateDiveList();
 	}
 }