more visual contrast for active page in pagination widget

What does this MR do?

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

I made border blue because it looked odd otherwise (kinda sunken)

Why was this MR needed?

Noticed issue while working on Projects Dashboard issue

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #32470 (closed)