Only consider global bans for lobby server bans

(fixes #222)

Author: Brutus5000

migrations/V87__fix_lobby_ban_view.sql

@@ -0,0 +1,8 @@
+DROP VIEW `lobby_ban`;
+
+CREATE VIEW `lobby_ban` AS
+SELECT `ban`.`player_id`                                                             AS `idUser`,
+       `ban`.`reason`                                                                AS `reason`,
+       coalesce(`ban`.`revoke_time`, `ban`.`expires_at`, cast('2999-12-31' as date)) AS `expires_at`
+FROM `ban`
+WHERE (`ban`.`level` = 'GLOBAL');