Thermex IF 60 V: add compatible IF 80 V

Devices are identical. Match was only 83% because the device provides a
redundant read-only copy of the target temperature.

Issue #2867

custom_components/tuya_local/devices/thermex_if50v_waterheater.yaml

@@ -3,6 +3,9 @@ products:
   - id: sz9gfbdn5my6GCfR
     manufacturer: Thermex
     model: IF 50 V pro
+  - id: hdnneqsz20exqnmo
+    manufacturer: Thermex
+    model: ID 80 V pro
 entities:
   - entity: water_heater
     dps: