### 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)
old_x = mm->get_position().x;
			old_y = mm->get_position().y;
			if (windows[window_id].window_has_focus || window_get_active_popup() == window_id) {
				Input::get_singleton()->parse_input_event(mm);
			}
			return 0; 
		} break;
		case WM_MOUSEMOVE: {
			if (windows[window_id].block_mm) {
				break;
			}
			if (mouse_mode == MOUSE_MODE_CAPTURED && use_raw_input) {
				break;
			}
			if (Input::get_singleton()->is_emulating_mouse_from_touch()) {
				
				LPARAM extra = GetMessageExtraInfo();
				if (IsTouchEvent(extra)) {
					break;
				}
			}
			DisplayServer::WindowID over_id = get_window_at_screen_position(mouse_get_position());
			if (windows.has(over_id) && !Rect2(window_get_position(over_id), Point2(windows[over_id].width, windows[over_id].height)).has_point(mouse_get_position())) {
				
				over_id = INVALID_WINDOW_ID;
			}
			if (window_mouseover_id != over_id) {
				
				if (mouse_mode != MOUSE_MODE_CAPTURED) {
					if (window_mouseover_id != INVALID_WINDOW_ID && windows.has(window_mouseover_id)) {