feat(aquatech_fusionx8_waterheater): add Hydrotherm branded product

Same model name, different brand and product id

Issue #5871

custom_components/tuya_local/devices/aquatech_x8fusion_waterheater.yaml

@@ -3,7 +3,9 @@ products:
   - id: 4zrn3rqjibkude2z
     manufacturer: Aquatech
     model: Fusion/X8
-
+  - id: qafgqk3ghlw5nqui
+    manufacturer: Hydrotherm
+    model: Fusion X8
 entities:
   - entity: water_heater
     translation_only_key: hot_water