Make collab env harder

Project/Assets/ML-Agents/Examples/WallJump/Prefabs/WallJumpCollabArea.prefab

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Project/Assets/ML-Agents/Examples/WallJump/Scenes/WallJumpCollab.unity

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Project/Assets/ML-Agents/Examples/WallJump/Scripts/WallJumpCollabAgent.cs

     protected override void ConfigureAgent(int config)
     {
         var localScale = wall.transform.localScale;
-        var height = m_ResetParams.GetWithDefault("big_wall_height", 8);
+        var height = m_ResetParams.GetWithDefault("big_wall_height", 10);
         localScale = new Vector3(
             localScale.x,
             height,