Fixes #20463 by adding class to search results header

What does this MR do?

This fixes #20463 (closed) by adding the .emoji-search class to the "Search results" h5 element. AwardsHandler.prototype.setupSearch() was trying to remove the element before creating a new one, but wasn't because the it was attempting to select it with the .emoji-search class, which wasn't being added.

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

I don't believe so.

Why was this MR needed?

See #20463 (closed)

What are the relevant issue numbers?

Closes #20463 (closed)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together Closes #20463 (closed)