Fixed re-upload of theme not working after deleting

no issue

- if a theme was uploaded with the same name as a previously deleted theme it was not being shown in the themes list, and if activated could not be found/seen as active breaking the design menu

ghost/admin/app/components/modals/design/confirm-delete-theme.js

@@ -18,6 +18,9 @@ export default class ConfirmDeleteThemeComponent extends Component {
     *deleteThemeTask() {
         try {
             yield this.args.data.theme.destroyRecord();
+            // we need to unload from the store here so that uploading another
+            // theme with the same "id" doesn't attempt to update the deleted record
+            this.args.data.theme.unloadRecord();
             this.args.close();
             return true;
         } catch (error) {