Fixed #2977 - Fixed the dark-mode style for the download location box in settings

[theaino]

Summary

Fixed the dark-mode style for the download location box in settings.

Ticket Link

Fixes #2977

Checklist

• Added or updated unit tests (required for all new features)
• Has UI changes
• [ x read and understood our Contributing Guidelines
• completed Mattermost Contributor Agreement
• executed npm run lint:js for proper code formatting
• Run E2E tests by adding label Run Desktop E2E Tests

Device Information

This PR was tested on: Fedora 40

Screenshots

Release Note

Fixed dark-mode style for download location in settings

[mattermost-build]

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[devinbinnie]

Thanks @theaino! LGTM!