Fix _set_groupswitch_member_state() function as well

Author: bouwew

plugwise/legacy/smile.py

@@ -264,8 +264,8 @@ async def _set_groupswitch_member_state(
         Set the given State of the relevant Switch within a group of members.
         """
         for member in members:
-            uri = f"{APPLIANCES};id={member}/{switch.func_type}"
             data = f"<{switch.func_type}><{switch.func}>{state}</{switch.func}></{switch.func_type}>"
+            uri = f"{APPLIANCES};id={member}/relay"
 
             await self.call_request(uri, method="put", data=data)