message: fix: after commit, the readlock must be updated for wait_for_change to work
diff: @@ -1737,9 +1737,15 @@ SharedGroup::version_type SharedGroup::commit()
  REALM_ASSERT(m_group.is_attached());
  version_type new_version = do_commit(); // Throws
  +
  + VersionID version_id = VersionID(); // Latest available snapshot
  + ReadLockInfo lock_after_commit;
  + grab_read_lock(lock_after_commit, version_id);
  + release_read_lock(lock_after_commit);
  +
  do_end_write();
  do_end_read();
  -
  + m_read_lock = lock_after_commit;
  m_transact_stage = transact_Ready;
  return new_version;
  }
  