Remove probably redundant `realmLock`
Remove probably redundant `realmLock`

As far as I can tell all accesses are safe due to update thread
guarantees. The only weird one may be async writes during a
`BlockAllOperations`, but the `Compact` loop should handle this quite
amicably.

peppy/osu,peppy/osu,ppy/osu,ppy/osu,peppy/osu,ppy/osu