fix extra keys not allowed

custom_components/tuya_local/devices/essentials_smart_electric_heater.yaml

@@ -34,9 +34,9 @@ entities:
         range:
           min: 70
           max: 300
-        step: 5
         mapping:
           - scale: 10
+            step: 5
       - id: 24
         name: current_temperature
         type: integer
@@ -44,9 +44,9 @@ entities:
         range:
           min: 0
           max: 800
-        step: 10
         mapping:
           - scale: 10
+            step: 10
   - entity: number
     name: Temperature correction
     category: config