AnimatedSprite's smooth property doesn't work

I've been prototyping a game with the same scaling mechanics as QTBUG-35457, and found that when switching from a static Image to AnimatedSprite, that the result is blurry instead of "blocky".

Since http://qt-project.org/doc/qt-5/qml-qtquick-item.html#smooth-prop states that smooth is primarily used in Image-based items, I think it makes sense that this should be implemented for AnimatedSprite.