Remove unused colorSpace
Remove unused colorSpace

The `colorSpace` variable in `Image.decoded` was assigned but never used.
farice/VennCache,tomaskraina/Kingfisher,tomaskraina/Kingfisher,farice/VennCache,farice/VennCache,pNre/Kingfisher,pNre/Kingfisher,pNre/Kingfisher,tomaskraina/Kingfisher