fix agent processor test

ml-agents/mlagents/trainers/tests/test_agent_processor.py

     fake_action_info = ActionInfo(
         action=ActionTuple(continuous=np.array([[0.1], [0.1]])),
         env_action=ActionTuple(continuous=np.array([[0.1], [0.1]])),
-        value=[0.1, 0.1],
         outputs=fake_action_outputs,
         agent_ids=mock_decision_steps.agent_id,
     )
     fake_action_info = ActionInfo(
         action=ActionTuple(continuous=np.array([[0.1]])),
         env_action=ActionTuple(continuous=np.array([[0.1]])),
-        value=[0.1],
         outputs=fake_action_outputs,
         agent_ids=mock_decision_step.agent_id,
     )
     fake_action_info = ActionInfo(
         action=ActionTuple(continuous=np.array([[0.1]])),
         env_action=ActionTuple(continuous=np.array([[0.1]])),
-        value=[0.1],
         outputs=fake_action_outputs,
         agent_ids=mock_decision_step.agent_id,
     )