LibWeb: Add missing calls to Base::children_changed

Also making sure that it is called at the top of the implementation
for consistency.

Libraries/LibWeb/HTML/HTMLScriptElement.cpp

@@ -574,6 +574,8 @@ void HTMLScriptElement::prepare_script()
 // https://html.spec.whatwg.org/multipage/scripting.html#script-processing-model:html-element-post-connection-steps-4
 void HTMLScriptElement::children_changed()
 {
+    Base::children_changed();
+
     // 1. Run the script HTML element post-connection steps, given the script element.
     post_connection();
 }