Update tengine-metadata.json (#628)

source/tengine-metadata.json

@@ -1061,12 +1061,6 @@
       ]
     }
   },
-  {
-    "name": "Scatter",
-    "schema": {
-      "category": "Layer"
-    }
-  },
   {
     "name": "Shape",
     "schema": {