use objects.save in display layouts and new folder

src/plugins/displayLayout/components/DisplayLayout.vue

@@ -630,7 +630,7 @@ export default {
             object.identifier = identifier;
             object.location = parentKeyString;
 
-            this.openmct.objects.mutate(object, 'created', Date.now());
+            this.openmct.objects.save(object);
 
             return object;
         },

src/plugins/newFolderAction/newFolderAction.js

@@ -72,7 +72,8 @@ export default class NewFolderAction {
             folderType.definition.initialize(objectModel);
             objectModel.name = name || 'New Folder';
 
-            this._openmct.objects.mutate(objectModel, 'created', Date.now());
+            this._openmct.objects.save(objectModel);
+
             composition.add(objectModel);
         });
     }