fix duplicate schema for JobState (#20684)

Author: kristapratico

dev/cognitiveservices/data-plane/Language/common.json

@@ -270,7 +270,7 @@
           "type": "string",
           "x-ms-enum": {
             "modelAsString": true,
-            "name": "JobState"
+            "name": "State"
           }
         },
         "errors": {