Get data from async_update() as in Core plugwise

Author: bouwew

tests/test_smile.py

@@ -387,7 +387,7 @@ async def device_test(
                 _LOGGER.info("Asserting testdata:")
                 await smile._full_update_device()
                 smile.get_all_devices()
-                data = pw_constants.PlugwiseData(smile.gw_data, smile.gw_devices)
+                data = await smile.async_update()
             else:
                 _LOGGER.info("Asserting updated testdata:")
                 data = await smile.async_update()