cleanup test changes for auto-join implementation

Author: dirixmjm

plugwise_usb/api.py

@@ -415,13 +415,6 @@ def temperature(self) -> float:
         Raises NodeError when temperature feature is not present at device.
         """
 
-    @property
-    def auto_join(self) -> bool:
-        """Last received auto_join state.
-
-        Raises NodeError when circleplus feature is not present at device.
-        """
-
     # endregion
 
     # region control

plugwise_usb/nodes/circle.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-from abc import ABC
 from asyncio import Task, create_task
 from collections.abc import Awaitable, Callable
 from dataclasses import replace
@@ -73,7 +72,7 @@ def decorated(*args: Any, **kwargs: Any) -> Any:
     return cast(FuncT, decorated)
 
 
-class PlugwiseCircle(PlugwiseBaseNode, ABC):
+class PlugwiseCircle(PlugwiseBaseNode):
     """Plugwise Circle node."""
 
     def __init__(