Fix crash and inconsistent ordering when using ShuffleOrderIndexProvider

[nielsvanvelzen]

Some issues that probably happened because I was developing the playback rewrite on multiple branches and at some point merging some incompatible stuff came together to create this issue.

Changes

• Make sure we never set currentMediaItemIndex to 1 when there is no next item in the generated media3 playlist
• Always use index 0 in replaceQueue as the index mapping (via sortOrder) will give a randomized value already. Setting a random index in replaceQueue will just skip a bunch of queue items
• Do all value setting in replaceQueue with the coroutineScope to prevent race conditions when the coroutine is delayed
• Fix ShuffleOrderIndexProvider not really shuffling. The first two items were shuffled but everything after that was just repeating the second item... oops

Issues

Supersedes #3249
Fixes #3248