fix: fixed post card border color issue (#640)

[Lunyachek]

Description

Backport from master - https://github.com/openedx/frontend-app-discussions/pull/640

When trying to post on the forum, the option to mark your post as “Discussion” or “Question” is not enabled

Before fix

After fix

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (open-release/quince.master@2dafb6a). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## open-release/quince.master #677 +/- ## ============================================================= Coverage ? 92.43% ============================================================= Files ? 169 Lines ? 3451 Branches ? 898 ============================================================= Hits ? 3190 Misses ? 241 Partials ? 20 ```

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