fix(GlFormInput): set height of form input

mentioned in commit b670afc2

mentioned in merge request gitlab-org/frontend/pajamas-adoption-scanner!168 (merged)

mentioned in merge request status-page!835 (merged)

mentioned in merge request gitlab!126562 (merged)

mentioned in merge request status-page!836 (closed)

mentioned in merge request status-page!838 (merged)

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

mentioned in merge request gitlab-docs!4099 (merged)

mentioned in merge request gitlab!128113 (closed)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!3479 (merged)