### 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)
} break;
		case NOTIFICATION_TRANSLATION_CHANGED: {
			_invalidate_theme_cache();
			_update_theme_item_cache();
			if (!embedder && window_id != DisplayServer::INVALID_WINDOW_ID) {
				String tr_title = atr(title);
#ifdef DEBUG_ENABLED
				if (window_id == DisplayServer::MAIN_WINDOW_ID) {
					
					
					
					tr_title = vformat("%s (DEBUG)", tr_title);
				}
#endif
				DisplayServer::get_singleton()->window_set_title(tr_title, window_id);
			}
		} break;
		case NOTIFICATION_VISIBILITY_CHANGED: {
			if (unparent_when_invisible && !is_visible()) {
				Node *p = get_parent();
				if (p) {
					p->remove_child(this);
				}
			}
		} break;
		case NOTIFICATION_EXIT_TREE: {
			if (transient) {
				_clear_transient();
			}
			if (!is_embedded() && window_id != DisplayServer::INVALID_WINDOW_ID) {