Resolve "Collapsed MR sidebar avatar is not aligned correctly"

What does this MR do?

Stops the avatar on the MR page from being cut off when the sidebar is collapsed

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

Not particularly

Why was this MR needed?

Because the avatar was being cut off on the MR page when you collapsed the sidebar.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a UX Designer
  • Has been reviewed by a Frontend maintainer
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #46751 (closed)