YL01 water tester: scale Chlorine readings by 10

Tuya app reports 0.5 when we are reporting 5 for this.
Issue #2056

custom_components/tuya_local/devices/ble_yl01_watertester.yaml

@@ -65,6 +65,8 @@ secondary_entities:
         name: sensor
         unit: mg/L
         class: measurement
+        mapping:
+          - scale: 10
   - entity: select
     name: pH buffer standard
     icon: "mdi:ph"