fix wrong scale and unnecessary step

custom_components/tuya_local/devices/essentials_smart_electric_heater.yaml

@@ -59,9 +59,6 @@ entities:
         range:
           min: -5
           max: 5
-        mapping:
-          - scale: 0
-            step: 1
   - entity: lock
     translation_key: child_lock
     category: config