Fix ColorsAPI

[KingEnderBrine]

I can only assume the real issue is JIT in Unity 2021 being very agressive with optimizations for dynamically generated methods (hooks in our case) when accessing static readonly arrays.

From debugging and logging it seems to me that a hook refers to a specific object ptr instead of a field. Adding new color creates new array and the hook still using old array which eventually gets deallocated and the hook returns random data.
Only making a hook, works fine. Only adding new colors to an array works fine. But doing both results in wrong results. A happy accident that it doesn't cause a crash, just because these methods don't use actual array length and instead uses enum value.

Probably propper solution would be making a patcher that would remove readonly modificator from these fields to ensure there is no more JIT shenanigans, but for this case it should be fine the way I did it.

[KingEnderBrine]

Fixing #516