Atomi lights: allow brightness to go down to zero.

This should avoid the popup message in HA rejecting settings below 10% if the
light can handle it.

Issue #255

custom_components/tuya_local/devices/atomi_string_lights.yaml

@@ -35,7 +35,7 @@ primary_entity:
       name: brightness
       type: integer
       range:
-        min: 25
+        min: 0
         max: 255
     - id: 23
       name: color_temp