`nuke_display` is missing `container.data` for webp

[sureshjoshi]

I was working on local animated webp support and I noticed that I was unable to get container.data from nuke_display

override func nuke_display(image: UIImage?, data: Data?) {
  guard let image else {
      self.image = nil
      return
  }
  if let data {
    // never reached
    ...

The most barebones hack here gets this working and I can enable animated webp: main...sureshjoshi:Nuke:animated-webp-infra

I'll happily take a crack at a PR - but might need suggestions on where I might get caught up in tricky bugs, as I've only ever run very specific Nuke workflows