### 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)
_propagate_window_notification(this, NOTIFICATION_WM_WINDOW_FOCUS_IN);
			emit_signal(SNAME("focus_entered"));
		} break;
		case DisplayServer::WINDOW_EVENT_FOCUS_OUT: {
			focused = false;
			_propagate_window_notification(this, NOTIFICATION_WM_WINDOW_FOCUS_OUT);
			emit_signal(SNAME("focus_exited"));
		} break;
		case DisplayServer::WINDOW_EVENT_CLOSE_REQUEST: {
			if (exclusive_child != nullptr) {
				break; 
			}
			_propagate_window_notification(this, NOTIFICATION_WM_CLOSE_REQUEST);
			emit_signal(SNAME("close_requested"));
		} break;
		case DisplayServer::WINDOW_EVENT_GO_BACK_REQUEST: {
			_propagate_window_notification(this, NOTIFICATION_WM_GO_BACK_REQUEST);
			emit_signal(SNAME("go_back_requested"));
		} break;
		case DisplayServer::WINDOW_EVENT_DPI_CHANGE: {
			_update_viewport_size();
			_propagate_window_notification(this, NOTIFICATION_WM_DPI_CHANGE);
			emit_signal(SNAME("dpi_changed"));
		} break;
		case DisplayServer::WINDOW_EVENT_TITLEBAR_CHANGE: {
			emit_signal(SNAME("titlebar_changed"));
		} break;
	}
}
void Window::update_mouse_cursor_state() {