### 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)
mb->set_button_index(MouseButton::WHEEL_UP);
					} else {
						mb->set_button_index(MouseButton::WHEEL_DOWN);
					}
					mb->set_factor(fabs((double)motion / (double)WHEEL_DELTA));
				} break;
				case WM_MOUSEHWHEEL: {
					mb->set_pressed(true);
					int motion = (short)HIWORD(wParam);
					if (!motion) {
						return 0;
					}
					if (motion < 0) {
						mb->set_button_index(MouseButton::WHEEL_LEFT);
					} else {
						mb->set_button_index(MouseButton::WHEEL_RIGHT);
					}
					mb->set_factor(fabs((double)motion / (double)WHEEL_DELTA));
				} break;
				case WM_XBUTTONDOWN: {
					mb->set_pressed(true);
					if (HIWORD(wParam) == XBUTTON1) {
						mb->set_button_index(MouseButton::MB_XBUTTON1);
					} else {
						mb->set_button_index(MouseButton::MB_XBUTTON2);
					}
				} break;
				case WM_XBUTTONUP: {
					mb->set_pressed(false);
					if (HIWORD(wParam) == XBUTTON1) {