MR reviewer warning icon background fix

What does this MR do and why?

This is a follow-up to !198455 (comment 2645954450)

This fixes a small regression with the mentioned MR. Replaces the glowy shadow with a solid 1px border for a more crisp border.

Screenshots or screen recordings

Before After
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How to set up and validate locally

  1. Go to an MR with reviewers which can't merge, e.g. https://gdk.test:3000/flightjs/Flight/-/merge_requests/4

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #513105 (closed)

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