Update ems_waterheater.yaml

According to the owners manual, the max temp is 60 degrees C

custom_components/tuya_local/devices/ems_waterheater.yaml

@@ -27,7 +27,7 @@ entities:
         name: temperature
         range:
           min: 10
-          max: 70
+          max: 60
         unit: C
       - id: 4
         type: string