LibWeb/Fetch: Pass error from ResourceLoader into network_error

Userland/Libraries/LibWeb/Fetch/Fetching/Fetching.cpp

@@ -2226,7 +2226,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<PendingResponse>> nonstandard_resource_load
             auto response = Infrastructure::Response::create(vm);
             // FIXME: This is ugly, ResourceLoader should tell us.
             if (status_code.value_or(0) == 0) {
-                response = Infrastructure::Response::network_error(vm, "HTTP request failed"_string);
+                response = Infrastructure::Response::network_error(vm, TRY_OR_IGNORE(String::from_byte_string(error)));
             } else {
                 response->set_type(Infrastructure::Response::Type::Error);
                 response->set_status(status_code.value_or(400));