Add predictive back animation for settings pages

[SteffoSpieler]

Currently, when going back from a specific settings page (e.g. Icon packs), there is no predictive back animation. This feels a bit off when everything else in the app has such an animation.

It would be cool if this could be added :D

[alexbakker]

Feel free to give this a shot if you'd like! I haven't looked in this yet, but I'm afraid androidx.preference might hold us back here.