Update show.html.haml to allow guests to see the Files tab as per #30199

What does this MR do?

Shows the files tab to guest users for public projects. See https://gitlab.com/gitlab-org/gitlab-ce/issues/30199

Are there points in the code the reviewer needs to double check?

Probably needs a manual test on Public, Internal, and Private projects with a user logged in and logged out just to be safe.

Why was this MR needed?

Because #30199 (closed)

Screenshots (if relevant)

See #30199 (closed)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

#30199 (closed)

Merge request reports

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