### 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)
if (!wrap_controls) {
		updating_embedded_window = true;
		call_deferred(SNAME("_update_embedded_window"));
	} else {
		child_controls_changed();
	}
}
void Window::_update_embedded_window() {
	if (!updating_embedded_window) {
		return;
	}
	if (embedder) {
		embedder->_sub_window_update(this);
	};
	updating_embedded_window = false;
}
void Window::set_theme_type_variation(const StringName &p_theme_type) {
	ERR_MAIN_THREAD_GUARD;
	theme_type_variation = p_theme_type;
	if (is_inside_tree()) {
		notification(NOTIFICATION_THEME_CHANGED);
	}
}
StringName Window::get_theme_type_variation() const {