Add HTTP status code 400 to config_flow auth exceptions

MMH uses 400 for invalid credentials

Author: codyc1515

custom_components/managemyhealth/api.py

@@ -227,7 +227,7 @@ async def _api_wrapper(
                     json=json,
                     headers=headers,
                 )
-                if response.status in (401, 403):
+                if response.status in (400, 401, 403):
                     raise MmhApiAuthenticationError(
                         "Invalid credentials",
                     )