Fix warnings caused by animation randomizer running on disabled GameObjects (#268)

com.unity.perception/Runtime/Randomization/Randomizers/RandomizerExamples/Randomizers/AnimationRandomizer.cs

 
         void RandomizeAnimation(AnimationRandomizerTag tag)
         {
+            if (!tag.gameObject.activeInHierarchy)
+                return;
+
             var animator = tag.gameObject.GetComponent<Animator>();
             animator.applyRootMotion = tag.applyRootMotion;