fixup: changing assertion

Signed-off-by: Simon Schrottner <[email protected]>

Author: aepfli

providers/openfeature-provider-flagd/tests/test_grpc_watcher.py

@@ -160,4 +160,4 @@ def test_selector_passed_via_both_metadata_and_body(self):
         kwargs = call_args.kwargs
         self.assertIn("metadata", kwargs)
         metadata = kwargs["metadata"]
-        self.assertEqual(metadata, [("flagd-selector", "test-selector")])
+        self.assertEqual(metadata, (("flagd-selector", "test-selector"),))