Sendo air conditioner - remove duplicate config attribute

category: diagnostic was in there twice fro the sleep switch.

Mentioned in comment on issue #255

custom_components/tuya_local/devices/sendo_airconditioner_c.yaml

@@ -91,7 +91,6 @@ secondary_entities:
     name: Sleep
     category: config
     icon: "mdi:power-sleep"
-    category: config
     dps:
       - id: 102
         name: switch