Unable to unassign copilot once it is assign

[drasticdpk]

Steps

1. Open draft challenge which has assigned copilot.
2. Try to unassign the copilot.

Reference

https://challenges.topcoder.com/projects/24943/challenges/f2827023-f799-4491-a6d2-a3686dcf9f65/edit

[lakshmiathreya]

cc @mtwomey

[drasticdpk]

QA Verified.

Before

After

cc @vikasrohit

[vikasrohit]

@drasticdpk new designs are due soon, so hopefully it won't be rendered like this in new designs.