discovery: fix integration test fixture for ResourceDetailsFetcher's new constructor

CI mypy caught a missed instantiation site -- the integration test's
resource_details_fetcher fixture still called ResourceDetailsFetcher()
with no args, missed by an earlier grep that accidentally excluded
both files named test_resource_details_fetcher.py (unit and
integration).

Author: theyostalservice

tests/integration/discovery/test_resource_details_fetcher.py

@@ -10,8 +10,8 @@
 
 
 @pytest.fixture
-def resource_details_fetcher() -> ResourceDetailsFetcher:
-    return ResourceDetailsFetcher()
+def resource_details_fetcher(models_fetcher: ModelsFetcher) -> ResourceDetailsFetcher:
+    return ResourceDetailsFetcher(models_fetcher=models_fetcher)
 
 
 async def test_resource_details_fetcher_accepts_unique_id_for_model(