Arlec thermostat: remove climate mode switch

This is now the same as switching the climate entity on/off, so no
longer required.

custom_components/tuya_local/devices/arlec_thermostat_smartplug.yaml

@@ -120,18 +120,6 @@ secondary_entities:
         mapping:
           - scale: 60
             step: 60
-  - entity: switch
-    name: Climate mode
-    category: config
-    dps:
-      - id: 9
-        type: boolean
-        name: switch
-        mapping:
-          - dps_val: true
-            icon: "mdi:thermostat-auto"
-          - dps_val: false
-            icon: "mdi:toggle-switch"
   - entity: sensor
     name: Current
     class: current