Polytherm Polyalpha: minor changes

- remove name from thermostat (use translation key)
- PR was a contribution not assistance

PR #3279

custom_components/tuya_local/devices/polytherm_polyalpha_thermostat.yaml

@@ -2,10 +2,9 @@ name: Thermostat
 products:
   - id: k2vv9hr0yumh0vo8
     manufacturer: Polytherm
-    model: Polyalpha Thermostat
+    model: Polyalpha
 entities:
   - entity: climate
-    name: thermostat
     translation_key: thermostat
     dps:
       - id: 1