### 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.");
	ERR_FAIL_COND_MSG(p_ratio <= 0.0 || p_ratio > 1.0, "Ratio must be between 0.0 and 1.0!");
	Rect2 parent_rect;
	if (is_embedded()) {
		parent_rect = get_embedder()->get_visible_rect();
	} else {
		DisplayServer::WindowID parent_id = get_parent_visible_window()->get_window_id();
		int parent_screen = DisplayServer::get_singleton()->window_get_current_screen(parent_id);
		parent_rect.position = DisplayServer::get_singleton()->screen_get_position(parent_screen);
		parent_rect.size = DisplayServer::get_singleton()->screen_get_size(parent_screen);
	}
	Rect2i popup_rect;
	if (parent_rect != Rect2()) {
		popup_rect.size = parent_rect.size * p_ratio;
		popup_rect.size = _clamp_window_size(popup_rect.size);
		popup_rect.position = parent_rect.position + (parent_rect.size - popup_rect.size) / 2;
	}
	popup(popup_rect);
}
void Window::popup(const Rect2i &p_screen_rect) {