fix config flow for HA 2023.9.0

Author: hekmon

custom_components/rtetempo/config_flow.py

@@ -9,7 +9,7 @@
 import voluptuous as vol
 
 from homeassistant import config_entries
-from homeassistant.core import HomeAssistant, callback
+from homeassistant.core import callback
 from homeassistant.data_entry_flow import FlowResult
 
 from .api_worker import BadRequest, ServerError, UnexpectedError, application_tester
@@ -47,8 +47,7 @@ async def async_step_user(
         try:
             client_id = user_input[CONFIG_CLIENT_ID]
             client_secret = user_input[CONFIG_CLIEND_SECRET]
-            hass = HomeAssistant()
-            await hass.async_add_executor_job(
+            await self.hass.async_add_executor_job(
                 lambda: application_tester(str(client_id), str(client_secret))
             )
         except RequestException as request_exception: