Fix project audit log spec

What does this MR do?

On GitLab.com, the internal visibility setting for project is disabled. See this issue: #12388 (closed)

This MR updates the test to change the visibility to private instead of internal.

Closes: #221019 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content