Update var-name in test as well

Author: bouwew

tests/test_smile.py

@@ -3135,8 +3135,8 @@ async def test_connect_anna_heatpump_cooling_to_off(self):
         self.smile_setup = "anna_heatpump_cooling_to_off"
         server, smile, client = await self.connect_wrapper()
 
-        # Preset _cooling_enabled to True, will turn to False due to the lowered outdoor temp
-        smile._cooling_enabled = True
+        # Preset _anna_cooling_derived to True, will turn to False due to the lowered outdoor temp
+        smile._anna_cooling_derived = True
         await self.device_test(smile, testdata)
         await smile.close_connection()
         await self.disconnect(server, client)