Remove extra space above custom field row details

What does this MR do and why?

Removes extraneous spacing above expanded row details to improve layout.

References

Screenshots or screen recordings

Before After
Screenshot 2025-09-09 at 9.25.18 AM.png Screenshot 2025-09-09 at 9.27.32 AM.png

How to set up and validate locally

  1. Navigate to a root group Issue settings (https://gdk.test:3443/groups/flightjs/-/settings/issues)
  2. Add a custom field if you don't have one
  3. Expand the row

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