[core] Adjust IEP code to /check IEP at 56 exactly

[WinterSolstice8]

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• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Level 56 mobs were not checking IEP to 99s, so they will now. > to >=
Also adjusted the order of IEP level/exp min for consistency in c++

Steps to test these changes