Sleep in "worldstate_restore" test should not be necessary.

[github-actions[bot]]

code smell.

https://github.com/rdaum/moor/blob/47435a1442a1f5532c23944029e90982baa99bff/crates/db/tests/worldstate_restore.rs#L87

            tx.commit().unwrap();
            db.shutdown();

            // TODO: Sleep in "worldstate_restore" test should not be necessary.
            //   code smell.
            std::thread::sleep(Duration::from_millis(100));
            a