Kennedy fireplace: rename Flame red dp

At one point I was toying with making this a number entity, and forgot to change
the dp name back when I reverted to a select entity.

custom_components/tuya_local/devices/kennedy_fireplace.yaml

@@ -142,7 +142,7 @@ secondary_entities:
     dps:
       - id: 102
         type: string
-        name: value
+        name: option
         mapping:
           - dps_val: "0"
             value: "Off"