Fix mypy.

Author: dbernstein

tests/manager/search/test_external_search.py

@@ -1121,7 +1121,7 @@ def test_facet_filtering(self, end_to_end_search_fixture: EndToEndSearchFixture)
         data = self._populate_works(fixture)
         fixture.populate_search_index()
 
-        def expect(availability, collection, works):
+        def expect(availability, works):
             facets = Facets(
                 transaction.default_library(),
                 availability,