fix gitlab-org/gitlab-ce#41891 (design nitpick)

What does this MR do?

Fixes design nitpick gitlab-org/gitlab-ce#41891

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

If removing an empty %span.logo-text does not break some corner case I didn't see.

Why was this MR needed?

To improve the design.

Screenshots (if relevant)

Before:

After:

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered

What are the relevant issue numbers?

• gitlab-org/gitlab-ce#41891