LibWeb: Change id to be optional in HTML::NavigationParams

Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/0c919718ae
Pull-request: https://github.com/SerenityOS/serenity/pull/18601
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/HTML/NavigationParams.h

@@ -19,8 +19,8 @@ namespace Web::HTML {
 
 // https://html.spec.whatwg.org/multipage/browsing-the-web.html#navigation-params
 struct NavigationParams {
-    // a navigation id
-    String id;
+    // null or a navigation ID
+    Optional<String> id;
 
     // null or a request that started the navigation
     JS::GCPtr<Fetch::Infrastructure::Request> request;