Yinmik water quality: remove unneeded range and mapping

PR #2421

custom_components/tuya_local/devices/yinmik_waterquality_tester.yaml

@@ -25,10 +25,6 @@ secondary_entities:
         class: measurement
         unit: ppm
         optional: true
-        mapping:
-          - range:
-            min: 0
-            max: 1000
   - entity: sensor
     class: battery
     category: diagnostic