Fixed a bug on not showing images in iOS14 on YYAnimatedImageView #150
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On iOS 13: If we override this, UIKit will render the UIImageView.image itself before calling this method. So even if self.currentFrame == nil, the UIImageView.image get rendered.
On iOS 14: UIKit no longer render anything if you override that displayLayer: method. We can have a backup to render layer.contents for this case by ourself.