LibWeb: Call page_did_start_loading() before load_resource()

Otherwise we would sometimes (dependent on the load time, I believe) end
up setting the document and eventually calling title change callbacks
before communicating that the page started loading.

Userland/Libraries/LibWeb/Loader/FrameLoader.cpp

@@ -143,13 +143,13 @@ bool FrameLoader::load(const LoadRequest& request, Type type)
 
     auto& url = request.url();
 
-    set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
-
     if (type == Type::Navigation) {
         if (auto* page = frame().page())
             page->client().page_did_start_loading(url);
     }
 
+    set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
+
     if (type == Type::IFrame)
         return true;