HY08WE-2 thermostat: generalise for HY08WE.

Issue #498 reports this working on HE08WE-4 (actually it was also reported on
the original issue almost 6 months ago, but at that time this config was the
only Hysen thermostat supported, so it didn't seem confusing with just a minor
number mismatch).

custom_components/tuya_local/devices/hysen_hy08we2_thermostat.yaml

@@ -1,4 +1,7 @@
-name: Hysen HY08WE-2 thermostat
+name: Hysen HY08WE thermostat
+products:
+  - id: gu4vs8axzlw5ptw3
+    name: HY08WE-4
 primary_entity:
   entity: climate
   dps: