added striker/goalie brain to prefab

Project/Assets/ML-Agents/Examples/Soccer/Prefabs/StrikersVsGoalieField.prefab

     vectorActionSize: 030000000300000003000000
     vectorActionDescriptions: []
     vectorActionSpaceType: 0
-  m_Model: {fileID: 11400000, guid: 3760d1cef396640f486ebe96b48d4f37, type: 3}
+  m_Model: {fileID: 11400000, guid: e9c10c18f4eb745d19186a54dbe3ca2e, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: Goalie
     vectorActionSize: 030000000300000003000000
     vectorActionDescriptions: []
     vectorActionSpaceType: 0
-  m_Model: {fileID: 11400000, guid: eef58e4530eb940e28760b9a668bc93c, type: 3}
+  m_Model: {fileID: 11400000, guid: 75a830685bf8e43918adc4783a2abebf, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: Striker
     vectorActionSize: 030000000300000003000000
     vectorActionDescriptions: []
     vectorActionSpaceType: 0
-  m_Model: {fileID: 11400000, guid: eef58e4530eb940e28760b9a668bc93c, type: 3}
+  m_Model: {fileID: 11400000, guid: 75a830685bf8e43918adc4783a2abebf, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: Striker