Korex kettle: rename temperature_c dp

Fix overlooked copy-paste naming issue.
PR #3301

custom_components/tuya_local/devices/korex_axwf306n_smart_kettle.yaml

@@ -73,7 +73,7 @@ entities:
             value: 212
       - id: 101
         type: string
-        name: temperature_f
+        name: temperature_c
         hidden: true
         range:
           min: 45