### 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_READ_THREAD_GUARD;
	Ref<Theme> default_theme = ThemeDB::get_singleton()->get_default_theme();
	p_list->push_back(PropertyInfo(Variant::NIL, GNAME("Theme Overrides", "theme_override_"), PROPERTY_HINT_NONE, "theme_override_", PROPERTY_USAGE_GROUP));
	{
		List<StringName> names;
		default_theme->get_color_list(get_class_name(), &names);
		for (const StringName &E : names) {
			uint32_t usage = PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_CHECKABLE;
			if (theme_color_override.has(E)) {
				usage |= PROPERTY_USAGE_STORAGE | PROPERTY_USAGE_CHECKED;
			}