This is a followup from #1843774: Convert views/views_ui/templates/views-ui-display-tab-setting.tpl.php to Twig.
The docs for template_preprocess_views_ui_display_tab_setting() say this:
+ * - defaulted: A boolean indicating the setting is in it's default state.
+ * - overridden: A boolean indicating the setting has been overridden from
+ * the default.Which implies that these two variables are just logical opposites of each other, ie. defaulted = !overridden. Either the docs are wrong/misleading or we don't need to set both of these variables.
However, this task should be postponed on #1987510: [meta] Convert all core *.tpl.php templates to Twig as singular patch.