whiten_rewards parameter in RLOO config is not used.

[velezbeltran]

Reproduction

Hello!

I think there is a small bug. I was trying to find out what the difference was between the whiten_rewards and normalize_rewards parameter in the RLOOConfig object and after inspecting the code for the RLOOTrainer class I found that it is not used. Hence, I think it should probably be removed.

Thank you for your help and the codebase! It is super helpful.

System Info

I can see this in the codebase.

Checklist

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• I have included my system information
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