Fix issue where LottieAnimationLayer.pause() didn't update currentPlaybackMode

[calda]

This PR fixes an issue where LottieAnimationLayer.pause() didn't update currentPlaybackMode.

I was writing the announcement for Lottie 4.3.0, and included this sample code:

// The Lottie animation is controlled by this SwiftUI state
@State var playbackMode = LottiePlaybackMode.pause

var body: some View {
  HStack {
    LottieView(animation: .named("HeartAnimation"))
      .play(playbackMode)
      .animationDidFinish { _ in
        playbackMode = .pause
      }
  
    // When the button is pressed, trigger the animation to start playing from the beginning
    Button {
      playbackMode = .fromProgress(0, toProgress: 1, loopMode: .playOnce)
    } label: {
      Image(systemName: "play.fill")
    }
  }
}

When testing that on master, setting playbackMode = .fromProgress(0, toProgress: 1, loopMode: .playOnce) didn't cause the animation to start playing again.

This was because LottieAnimationLayer.pause() wasn't updating currentPlaybackMode, so the value of currentPlaybackMode was still .fromProgress(0, toProgress: 1, loopMode: .playOnce). That caused subsequent calls to be ignored.

Before	After