chore: add webui_resources to pak (#16009)

fixes #16006

electron_paks.gni

@@ -60,6 +60,7 @@ template("electron_extra_paks") {
       "$root_gen_dir/mojo/public/js/mojo_bindings_resources.pak",
       "$root_gen_dir/net/net_resources.pak",
       "$root_gen_dir/third_party/blink/public/resources/blink_resources.pak",
+      "$root_gen_dir/ui/resources/webui_resources.pak",
       "$target_gen_dir/electron_resources.pak",
     ]
     deps = [
@@ -71,6 +72,7 @@ template("electron_extra_paks") {
       "//mojo/public/js:resources",
       "//net:net_resources",
       "//third_party/blink/public:resources",
+      "//ui/resources",
     ]
     if (defined(invoker.deps)) {
       deps += invoker.deps