[ASImageNode] Adjust category naming for AnimatedImage properties to fix compiler warnings.

AsyncDisplayKit/ASImageNode.h

@@ -112,6 +112,10 @@ typedef UIImage * _Nullable (^asimagenode_modification_block_t)(UIImage *image);
  */
 - (void)setNeedsDisplayWithCompletion:(void (^ _Nullable)(BOOL canceled))displayCompletionBlock;
 
+@end
+
+@interface ASImageNode (AnimatedImage)
+
 /**
  * @abstract The animated image to playback
  *