fix extra keys not allowed

custom_components/tuya_local/devices/essentials_smart_electric_heater.yaml

@@ -34,7 +34,6 @@ entities:
         range:
           min: 70
           max: 300
-        scale: 1
         step: 5
         mapping:
           - scale: 10
@@ -45,7 +44,6 @@ entities:
         range:
           min: 0
           max: 800
-        scale: 1
         step: 10
         mapping:
           - scale: 10