Don't put anonymous players in games.players

Don't put anonymous players in games.players

The "games" table has a convenience, de-normalized column for storing the list
of player_ids who played in that game. This is intended for use in quick
searches. Since anonymous players (players having a player_id == 2) aren't
searchable, they don't need to be in this list. This should decrease the
overall size of the GIN index on that column over time.