Vertically centres landscape avatars those cannot fill up parent height.

What does this MR do?

A minor update to the stylesheet that correctly do vertical align on avatar images.

Parent element <a class="no-expend">...</a> currently relies on the content image for height, this renders the child style justify-self: center useless.

What are the relevant issue numbers?

N/A

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides