### 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;
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		DisplayServer::get_singleton()->window_set_ime_active(p_active, window_id);
	}
}
void Window::set_ime_position(const Point2i &p_pos) {
	ERR_MAIN_THREAD_GUARD;
	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
		DisplayServer::get_singleton()->window_set_ime_position(p_pos, window_id);
	}
}
bool Window::is_embedded() const {
	ERR_READ_THREAD_GUARD_V(false);
	return get_embedder() != nullptr;
}
bool Window::is_in_edited_scene_root() const {
	ERR_READ_THREAD_GUARD_V(false);
#ifdef TOOLS_ENABLED
	return is_part_of_edited_scene();
#else
	return false;
#endif
}
void Window::_make_window() {