added dynamic 3.5M step model

Project/Assets/ML-Agents/Examples/Worm/Prefabs/WormBasePrefabDynamic.prefab

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     vectorActionDescriptions: []
     vectorActionSpaceType: 1
-  m_Model: {fileID: 11400000, guid: 2054253fab8a54767834d0b9f9c0ed53, type: 3}
+  m_Model: {fileID: 11400000, guid: 3fa7b06c456814f86b5227de4dc88800, type: 3}
   m_InferenceDevice: 0
   m_BehaviorType: 0
   m_BehaviorName: WormDynamic

Project/Assets/ML-Agents/Examples/Worm/TFModels/WormDynamic.nn.meta

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+guid: 3fa7b06c456814f86b5227de4dc88800
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   fileIDToRecycleName:
     11400000: main obj