Fix image loop counter on iOS 14 (#30744)
Fix image loop counter on iOS 14 (#30744)

Summary:
Animated gifs, which do not loop, currently animate twice on iOS 14.
See: https://github.com/facebook/react-native/issues/30147

## Changelog

[iOS] [Fixed] - Animated images without loop no longer animate twice

Pull Request resolved: https://github.com/facebook/react-native/pull/30744

Test Plan:
Run the example app with any animated gif. I attached a gif, which is affected.

![checkmark](https://user-images.githubusercontent.com/54310840/104746529-b2e02900-574f-11eb-9870-0c03c769c990.gif)

Reviewed By: sammy-SC

Differential Revision: D25977626

Pulled By: PeteTheHeat

fbshipit-source-id: 889d4a7bed8f7a7be6a9a427501d0071b7c02b8c

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