Fixed Thethingsnetwork sensor issue so that it takes the most recent (last) item from the TTN data storage query result instead of the first. (#20790)

* Fixed Thethingsnetwork sensor issue so that it takes the most recent (last) item from the TTN data storage query result instead of the first.

* Update sensor.py

More pythonic way to get the last item of the sensor value list.

homeassistant/components/thethingsnetwork/sensor.py

@@ -153,7 +153,7 @@ class TtnDataStorage:
             return False
 
         data = await req.json()
-        self.data = data[0]
+        self.data = data[-1]
 
         for value in self._values.items():
             if value[0] not in self.data.keys():