Ecostrad Accent iQ: correct type of temperature unit dp

Was defined as boolean in one place, string in the other, but with
true and false mappings.
Based on the log on issue #3322, it should be boolean.

custom_components/tuya_local/devices/ecostrad_accentiq_heater.yaml

@@ -86,7 +86,7 @@ entities:
     category: config
     dps:
       - id: 101
-        type: string
+        type: boolean
         name: option
         mapping:
           - dps_val: true