fix IndexTest.test_gitlab_get_mirror_service_urls
fix IndexTest.test_gitlab_get_mirror_service_urls

This makes it actually call the method rather than mocking it.

fdroidtravis/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver