fixed broken prefabs

UnitySDK/Assets/ML-Agents/Examples/Crawler/Brains/CrawlerDynamicLearning.asset

 --- !u!114 &11400000
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-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 0}
   m_GameObject: {fileID: 0}
   m_Enabled: 1
   m_EditorHideFlags: 0
     - 
     - 
     vectorActionSpaceType: 1
-  model: {fileID: 5022602860645237092, guid: 94d1889cee00f4361b74cbc4eb129f11, type: 3}
+  model: {fileID: 11400000, guid: 94d1889cee00f4361b74cbc4eb129f11, type: 3}
   inferenceDevice: 0

UnitySDK/Assets/ML-Agents/Examples/Crawler/Brains/CrawlerStaticLearning.asset

 --- !u!114 &11400000
 MonoBehaviour:
   m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 0}
   m_GameObject: {fileID: 0}
   m_Enabled: 1
   m_EditorHideFlags: 0
     - 
     - 
     vectorActionSpaceType: 1
-  model: {fileID: 5022602860645237092, guid: 9dbf8cc316ac9410b961ed268824778f, type: 3}
+  model: {fileID: 11400000, guid: 9dbf8cc316ac9410b961ed268824778f, type: 3}
   inferenceDevice: 0

UnitySDK/Assets/ML-Agents/Examples/Crawler/Prefabs/Crawler.prefab.meta

-fileFormatVersion: 2
-guid: 0e8a62cb7c8f0483ebd12046bae9ca05
-NativeFormatImporter:
-  externalObjects: {}
-  mainObjectFileID: 100100000
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: