Fix fixture for OMPS without authentication

This is a leftover from switching integration test env
config from env vars to a YAML file.

Signed-off-by: Hunor Csomortáni <csomh@redhat.com>

tests/integration/authorization/authorization_test.py

@@ -3,18 +3,16 @@
 # see the LICENSE file for license
 #
 
-import os
+
 import shutil
 import pytest
 import requests
 from tests.integration.utils import OMPS
 
 
 @pytest.fixture(scope='module')
-def no_auth_omps():
-    api_url = os.getenv('OMPS_INT_TEST_OMPS_URL')
-
-    return OMPS(api_url)
+def no_auth_omps(test_env):
+    return OMPS(test_env['omps_url'])
 
 
 def test_upload_without_authorization(test_env, no_auth_omps, tmp_path):