### 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)
return "Windows";
}
void DisplayServerWindows::_set_mouse_mode_impl(MouseMode p_mode) {
	if (windows.has(MAIN_WINDOW_ID) && (p_mode == MOUSE_MODE_CAPTURED || p_mode == MOUSE_MODE_CONFINED || p_mode == MOUSE_MODE_CONFINED_HIDDEN)) {
		
		WindowID window_id = _get_focused_window_or_popup();
		if (!windows.has(window_id)) {
			window_id = MAIN_WINDOW_ID;
		}
		WindowData &wd = windows[window_id];
		RECT clipRect;
		GetClientRect(wd.hWnd, &clipRect);
		ClientToScreen(wd.hWnd, (POINT *)&clipRect.left);
		ClientToScreen(wd.hWnd, (POINT *)&clipRect.right);
		ClipCursor(&clipRect);
		if (p_mode == MOUSE_MODE_CAPTURED) {
			center = window_get_size() / 2;
			POINT pos = { (int)center.x, (int)center.y };
			ClientToScreen(wd.hWnd, &pos);