Hide servo internal shadow roots from the inspector by default (#35958)

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

components/script/dom/element.rs

@@ -542,6 +542,7 @@ impl Element {
             mode,
             slot_assignment_mode,
             clonable,
+            is_ua_widget,
             can_gc,
         );