fix: leaderboards should look for missing season_key

[iBotPeaches]

Had a user complain they should be on the service based leaderboards.

Investigate and saw were using the old deprecated season_number key.

MariaDB [leafapp_infinite]> select id,player_id,mode,season_number,season_key,medal_count from service_records where player_id=407668;
+-------+-----------+------+---------------+------------+-------------+
| id    | player_id | mode | season_number | season_key | medal_count |
+-------+-----------+------+---------------+------------+-------------+
| 82907 |    407668 |    1 |             1 | NULL       |      145247 |
| 88481 |    407668 |    1 |             1 | 1-1        |       10746 |
| 88482 |    407668 |    1 |             1 | 1-2        |       12311 |
| 88483 |    407668 |    1 |             1 | 2-1        |       50224 |
| 88484 |    407668 |    1 |             1 | 2-2        |       37463 |
| 85719 |    407668 |    1 |             1 | 3-1        |       29966 |
| 88485 |    407668 |    1 |             1 | 4-1        |        4537 |
| 82908 |    407668 |    3 |             1 | NULL       |       16465 |
+-------+-----------+------+---------------+------------+-------------+
8 rows in set (0.001 sec)

MariaDB [leafapp_infinite]>