[AVA] [data-plane] videoCreationProperties property should not be type string (Azure#14491)

Author: giakas

specification/videoanalyzer/data-plane/VideoAnalyzer.Edge/preview/1.0.0/AzureVideoAnalyzer.json

@@ -698,7 +698,6 @@
           "example": "myVideo001"
         },
         "videoCreationProperties": {
-          "type": "string",
           "description": "Optional video properties to be used in case a new video resource needs to be created on the service.",
           "$ref": "#/definitions/VideoCreationProperties"
         },