Fix agent obs

Project/Assets/ML-Agents/Examples/FoodCollector/Prefabs/BattleFoodArea.prefab

   - wall
   - agent1
   - frozenAgent
-  m_RaysPerDirection: 3
+  m_RaysPerDirection: 6
-  m_RayLength: 50
+  m_RayLength: 100
   m_RayLayerMask:
     serializedVersion: 2
     m_Bits: 4294967291