NEWT/Android: Fix suspense regression of commit d514ecbf052d013ea8c0982c490757678075a9ea

Explicit win.destroy() shall only be called at activity.onDestroy(),
 - GLStateKeeper preservation is marked at pause,
 - and the Window's surfaceDestroyed() will also issue destroy() - so it's safe

Reason: On Suspense (or power button), application is paused _without_ surfaceDestruction !