### 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)
_THREAD_SAFE_METHOD_
	ERR_FAIL_COND(!windows.has(p_window));
	ERR_FAIL_COND_MSG(p_window == MAIN_WINDOW_ID, "Main window cannot be deleted.");
	popup_close(p_window);
	WindowData &wd = windows[p_window];
	while (wd.transient_children.size()) {
		window_set_transient(*wd.transient_children.begin(), INVALID_WINDOW_ID);
	}
	if (wd.transient_parent != INVALID_WINDOW_ID) {