Fix error codemapping syntax.

custom_components/tuya_local/devices/goldair_gpcv_heater.yaml

@@ -29,8 +29,8 @@ primary_entity:
     - id: 6
       type: bitfield
       mapping:
-        dps_val: 0
-        value: "OK"
+        - dps_val: 0
+          value: "OK"
       readonly: true
       name: error
     - id: 7