remove demonstration recorder from crawler agent (#4556)

Project/Assets/ML-Agents/Examples/Crawler/Scenes/CrawlerStaticVariableSpeed.unity

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---- !u!1 &441460235 stripped
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---- !u!114 &441460236
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-  m_Name: 
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-  NumStepsToRecord: 10000
-  DemonstrationName: ExpCrawlerStaVS
-  DemonstrationDirectory: 
 --- !u!1001 &455366880
 PrefabInstance:
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 --- !u!81 &914210116
 AudioListener:
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