fix(test): assertions for missing claim on AuthProvider were not correct

the test was giving us a false positive because the verifier fixture is
also not behaving correctly when returning `uses_auth_verification`.

the test now fails, but the assertions are accurate based on what we have
in `benefits.oauth.views.authorize` and `benefits.oauth.middleware`.

tests/pytest/oauth/test_views.py

@@ -145,10 +145,9 @@ def test_authorize_success_without_verifier_claim(
 
     result = authorize(app_request)
 
-    mocked_oauth_client.authorize_access_token.assert_called_with(app_request)
     assert session.oauth_claim(app_request) is None
-    assert result.status_code == 302
-    assert result.url == reverse(ROUTE_CONFIRM)
+    assert result.status_code == 200
+    assert result.template_name == TEMPLATE_USER_ERROR
 
 
 @pytest.mark.django_db