Fix scrolling in MyMedia/NFTDetail

[elv-stav]

Scrolling feels a bit random.
It would make more sense to focus the first element in each row the first time that row is focused, and then restore whatever the last item was.

Unfortunately, Compose has a bug that is only fixed in 1.7.0 which is still in beta.
While this bug exists, applying Modifier.focusRestorer{} will cause the app to crash when scrolling rapidly across rows.
When it's fixed, a similar apporach to this can work for those screens