Fix verb to adjust predator slots

[Drulikar]

About the pull request

This PR fixes the adjust_predator_round admin verb that could never do anything because its max was always set to a value <= 0. Now it can adjust the pred_additional_max value if it doesn't result in a max lower than the current count. However, I expect the pred_current_num to be incorrect if there are say councilors playing since only WHITELIST_NORMAL checks the limit, but only CLAN_RANK_ADMIN (ancient) prevents pred_current_num incrementing... Let me know if & how you would want this corrected.

Explain why it's good for the game

Admin verbs shouldn't just be dead code.

Testing Photographs and Procedure

Screenshots & Videos

Changelog

🆑 Drathek
admin: Fixed the adjust_predator_round verb
/:cl:

[github-actions]

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