Avatto WT100: Limit temperature to above 5 degrees

The WT100 and WT200 support different temperature ranges.
WT100 is 0 - 70 C, WT200 is 5 - 95 C.
Limit the range to 5 - 70 to avoid going out of range on either.

Issue #1166

custom_components/tuya_local/devices/avatto_wt100_thermostat.yaml

@@ -30,7 +30,7 @@ primary_entity:
       unit: C
       optional: true
       range:
-        min: 0
+        min: 50
         max: 700
       mapping:
         - scale: 10