Arlec heater v2: remove error dp

This was not mentioned in the report #578, and may just be carried over
from the v1 config.

custom_components/tuya_local/devices/arlec_panel_heater_v2.yaml

@@ -35,14 +35,6 @@ primary_entity:
           value: "Comfort"
         - dps_val: "af"
           value: "Anti-frost"
-    - id: 12
-      name: error
-      type: bitfield
-      mapping:
-        - dps_val: 0
-          value: "OK"
-      readonly: true
-
 secondary_entities:
   - entity: lock
     name: Child lock