FoodCollectorAgent - don't convert bool to int (#4169)

Project/Assets/ML-Agents/Examples/FoodCollector/Scripts/FoodCollectorAgent.cs

             var localVelocity = transform.InverseTransformDirection(m_AgentRb.velocity);
             sensor.AddObservation(localVelocity.x);
             sensor.AddObservation(localVelocity.z);
-            sensor.AddObservation(System.Convert.ToInt32(m_Frozen));
-            sensor.AddObservation(System.Convert.ToInt32(m_Shoot));
+            sensor.AddObservation(m_Frozen);
+            sensor.AddObservation(m_Shoot);
         }
     }