fix: Vertical alignment of Duo loader

mentioned in commit 6a0b74a7

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!312 (merged)

mentioned in merge request gitlab-org/frontend/playground/accessibility-scanner!28 (merged)

mentioned in merge request status-page!903

mentioned in merge request gitlab!148674 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3792 (merged)