Fix the package ID for analytics. (#4798)

com.unity.ml-agents/package.json

     "com.unity.modules.jsonserialize": "1.0.0",
     "com.unity.modules.physics": "1.0.0",
     "com.unity.modules.physics2d": "1.0.0",
-    "com.unity.analytics": "1.0.0"
+    "com.unity.modules.unityanalytics": "1.0.0"
   }
 }