Restore top border when printing sticky header tables

Asherah Connorrequested to merge
push-urlnxlkvqosm into master

What does this MR do and why?

Restore top border when printing sticky header tables!

Sticky headers are behind an FF, so no changelog.

References

Screenshots or screen recordings

Before After
image image

How to set up and validate locally

  1. Enable the editor_sticky_table_headers FF.
  2. Make your wiki page with a table in it.
  3. Open print preview. Where's the top border?!
  4. Check this branch out.
  5. Open print preview. Prepare to be amazed!

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