Use click_element in project set_visibility

What does this MR do?

This is a follow up of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14773#note_195130588 Use click_element in project set_visibility

Conformity

• [-] Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• [-] 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