### Godot version

4.0.3.stable

### System information

windows 11

### Issue description

fullscreen on the window node is not working and will show up as a windowed.

### Steps to reproduce

disable Embed Subwindows in Project Settings/Display/Window.
create a window node and set its mode to fullscreen.

### Minimal reproduction project

[fullscreen.zip](https://github.com/godotengine/godot/files/11821834/fullscreen.zip)
ERR_MAIN_THREAD_GUARD;
	ERR_FAIL_COND(!is_inside_tree());
	ERR_FAIL_COND_MSG(window_id == DisplayServer::MAIN_WINDOW_ID, "Can't popup the main window.");
	if (!is_embedded()) {
		Window *window = get_parent_visible_window();
		if (!window) {
			popup(p_parent_rect);
		} else {
			popup(Rect2i(window->get_position() + p_parent_rect.position, p_parent_rect.size));
		}
	} else {
		popup(p_parent_rect);
	}
}
void Window::popup_centered_clamped(const Size2i &p_size, float p_fallback_ratio) {