LibWeb: Make DOM::Node::set_needs_style_update() schedule the update

After you mark a node as needing new style, there's no situation in
which we don't want a style update to happen, so just take care of
scheduling it automatically.

Libraries/LibWeb/DOM/Element.cpp

@@ -267,7 +267,6 @@ void Element::set_inner_html(StringView markup)
     }
 
     set_needs_style_update(true);
-    document().schedule_style_update();
     document().invalidate_layout();
 }