Fix related items header in dark mode

Simon Knoxrequested to merge
psimyn-master-patch-35388 into master

What does this MR do and why?

Fix related items header in dark mode

Screenshots or screen recordings

Before After
Screenshot_2024-07-03_at_15.26.56 Screenshot_2024-07-03_at_15.27.07
Screenshot_2024-07-03_at_15.26.40 light mode looks the same

How to set up and validate locally

  1. Enable dark mode
  2. Open an epic
  3. Add some related items

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