feat(Checkbox): Reset background

mentioned in commit f318747f

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!186 (merged)

mentioned in merge request status-page!854 (merged)

mentioned in merge request gitlab!126562 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3432 (merged)

mentioned in merge request gitlab-docs!4182 (merged)

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!197 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3508 (merged)