Fix new end-to-end test

What does this MR do?

This fix is based on the following comment in the MR that added the new test: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/15857#note_211350873

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content