fix(GlDatepicker): fix prop name typo

mentioned in commit e137f83b

mentioned in merge request gitlab!83745 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!2771 (merged)

mentioned in merge request status-page!486 (merged)

mentioned in commit gitlab-renovate-forks/gitlab@268bcc33

mentioned in merge request gitlab-docs!2563 (merged)

mentioned in commit gitlab-renovate-forks/gitlab@a6bac975

mentioned in commit gitlab-renovate-forks/gitlab@af753a61

mentioned in commit gitlab-renovate-forks/gitlab@9063de26

mentioned in merge request gitlab!85109 (merged)