Revert "Move self.therms_with_offset_func init"

This reverts commit a9ae3bd.

Author: bouwew

plugwise/helper.py

@@ -275,6 +275,7 @@ def __init__(self) -> None:
         self.smile_type: str
         self.smile_version: version.Version | None
         self.smile_zigbee_mac_address: str | None
+        self.therms_with_offset_func: list[str] = []
         self._zones: dict[str, GwEntityData] = {}
         SmileCommon.__init__(self)
 

plugwise/smile.py

@@ -93,7 +93,6 @@ def __init__(
         self.smile_name = smile_name
         self.smile_type = smile_type
         self.smile_version = smile_version
-        self.therms_with_offset_func: list[str] = []
         SmileData.__init__(self)
 
     async def full_xml_update(self) -> None: