Port checkbox in pipeline schedules

This changes the checkbox inside the pipeline
schedules form to be pajamas compliant

Changelog: changed

app/views/projects/pipeline_schedules/_form.html.haml

-= form_for [@project, @schedule], as: :schedule, html: { id: "new-pipeline-schedule-form", class: "js-pipeline-schedule-form pipeline-schedule-form" } do |f|
+= gitlab_ui_form_for [@project, @schedule], as: :schedule, html: { id: "new-pipeline-schedule-form", class: "js-pipeline-schedule-form pipeline-schedule-form" } do |f|
   = form_errors(@schedule)
   .form-group.row
     .col-md-9
@@ -37,8 +37,7 @@
     .col-md-9
       = f.label :active, s_('PipelineSchedules|Activated'), class: 'label-bold'
       %div
-        = f.check_box :active, required: false, value: @schedule.active?
-        = f.label :active, _('Active'), class: 'gl-font-weight-normal'
+        = f.gitlab_ui_checkbox_component :active, _('Active'), checkbox_options: { value: @schedule.active, required: false }
   .footer-block.row-content-block
     = f.submit _('Save pipeline schedule'), class: 'btn gl-button btn-confirm'
     = link_to _('Cancel'), pipeline_schedules_path(@project), class: 'btn gl-button btn-default btn-cancel'