fix(sundream_lcseries_chlorinator): fix level redirection

Due to conflicting needs between different configs, value redirection on null
only fully works if the default mapping is hidden.

Issue #5991

custom_components/tuya_local/devices/sundream_lcseries_chlorinator.yaml

@@ -48,6 +48,7 @@ entities:
               min: 5
               max: 100
           - step: 50
+            hidden: true  # prevent this from interfering with the redirect
       - id: 105
         type: integer
         optional: true