Remove AI cavarly

[Kwal]

I agree, all the times I've made it to the prince wave is because of exploiting the cavalry AI of the knights and it doesn't even suit the Nords. However, Nord cavalry does make it harder for our horsemen since they continuously have enemies on their tail and really can't afford a misstep. More archers and pikemen could work here, but I have a feeling the kiting will become too easy..