remove time bonus loss

Project/Assets/ML-Agents/Examples/Tennis/Scripts/HitWall.cs

     void AgentAWins()
     {
         m_AgentA.SetReward(1 + m_AgentA.timePenalty);
-        m_AgentB.SetReward(-1 - m_AgentB.timePenalty);
+        m_AgentB.SetReward(-1);
         m_AgentA.score += 1;
         Reset();
 
     {
-        m_AgentA.SetReward(-1 - m_AgentA.timePenalty);
+        m_AgentA.SetReward(-1);
         m_AgentB.SetReward(1 + m_AgentB.timePenalty);
         m_AgentB.score += 1;
         Reset();