AK: Fix URL's operator<<() and use it

Author: https://github.com/linusg
Commit: ad3871b64e
Pull-request: https://github.com/SerenityOS/serenity/pull/2253
Issue: https://github.com/SerenityOS/serenity/issues/2250

Libraries/LibWeb/DOM/HTMLScriptElement.cpp

@@ -78,7 +78,7 @@ void HTMLScriptElement::inserted_into(Node& new_parent)
 
     URL src_url = document().complete_url(src);
     if (src_url.protocol() == "file" && document().url().protocol() != src_url.protocol()) {
-        dbg() << "HTMLScriptElement: Forbidden to load " << src_url.to_string() << " from " << document().url().to_string();
+        dbg() << "HTMLScriptElement: Forbidden to load " << src_url << " from " << document().url();
         return;
     }