smartplug_encoded: use consistent name format for unknown attributes

custom_components/tuya_local/devices/smartplug_encoded.yaml

@@ -11,7 +11,7 @@ primary_entity:
       name: switch
     - id: 101
       type: base64
-      name: unknown101
+      name: unknown_101
       readonly: true
     - id: 102
       type: base64