chuangmi.plug.v3: Fixed power state status for updated firmware (#665)

* fixed power state status for updated firmware

* add spaces for linter

* comparison to True

* Update miio/chuangmi_plug.py

Co-Authored-By: Teemu R. <tpr@iki.fi>

Co-authored-by: Teemu R. <tpr@iki.fi>

miio/chuangmi_plug.py

@@ -46,7 +46,7 @@ def __init__(self, data: Dict[str, Any]) -> None:
     def power(self) -> bool:
         """Current power state."""
         if "on" in self.data:
-            return self.data["on"]
+            return self.data["on"] is True or self.data["on"] == "on"
         if "power" in self.data:
             return self.data["power"] == "on"