Revert "NearestAttackableTarget search adjustments"

This reverts commit f5fae6c8063e4d1eeec821053ea2dd82db084a81.
Lowered chances for creeper, zombies and skeletons to do PathfinderGoalNearestAttackableTarget searches. 0 meant it would always look for the nearest target, when this pathfindergoal was executed. 5 is a 20% chance, and 10 is a 10% chance