Implement restore_window for MacOS

[kettle11]

restore_window should be implemented here: https://github.com/kettle11/kettlewin/blob/e0bb32b4e9083493bafcc53e5e97f00a24978536/platforms/macos/src/application_mac.rs#L245

resture_window should return the window to a "Windowed" state that is neither minimized or fullscreen.