fix: set a default name if saved vis is untitled (#1314)

Manual backport of aca9a9c for DHIS2-9360
Saving named visualization again now retains it's name properly. As seen in #1273

packages/app/src/actions/index.js

@@ -163,7 +163,11 @@ export const tDoSaveVisualization = (
         }
 
         visualization.name =
+            // name provided in the Save dialog
             name ||
+            // existing name when saving the same modified visualization
+            visualization.name ||
+            // new visualization with no name provided in Save dialog
             i18n.t('Untitled {{visualizationType}} visualization, {{date}}', {
                 visualizationType: getChartTypeDisplayName(visualization.type),
                 date: new Date().toLocaleDateString(undefined, {