fix: integer value step (#1388)

Author: SusanPhevos

custom_components/xiaomi_home/miot/miot_spec.py

@@ -601,7 +601,10 @@ def value_format(self, value: Any) -> Any:
         if value is None:
             return None
         if self.format_ == int:
-            return int(round(value))
+            if self.value_range is None:
+                return int(round(value))
+            return int(
+                round(value / self.value_range.step) * self.value_range.step)
         if self.format_ == float:
             return round(value, self.precision)
         if self.format_ == bool: