Use NewYCbCrAligned for non subsample ratio image.
Use NewYCbCrAligned for non subsample ratio image.

LibJPEG needs additional padding for any subsample ratio images, maybe.
The fix is merged in 9b79498, this commit removes unneccesory switch.

shirase-aoi/go-libjpeg,pixiv/go-libjpeg,pixiv/go-libjpeg,shirase-aoi/go-libjpeg,pixiv/go-libjpeg