Add form-check-input class to checkbox input for visibility levels and import sources in admin area

app/helpers/application_settings_helper.rb

@@ -36,7 +36,7 @@ module ApplicationSettingsHelper
   # Return a group of checkboxes that use Bootstrap's button plugin for a
   # toggle button effect.
-  def restricted_level_checkboxes(help_block_id, checkbox_name)
+  def restricted_level_checkboxes(help_block_id, checkbox_name, options = {})
     Gitlab::VisibilityLevel.values.map do |level|
       checked = restricted_visibility_levels(true).include?(level)
       css_class = checked ? 'active' : ''
@@ -46,6 +46,7 @@ module ApplicationSettingsHelper
         check_box_tag(checkbox_name, level, checked,
                       autocomplete: 'off',
                       'aria-describedby' => help_block_id,
+                      'class' => options[:class],
                       id: tag_name) + visibility_level_icon(level) + visibility_level_label(level)
       end
     end
@@ -53,7 +54,7 @@ module ApplicationSettingsHelper
   # Return a group of checkboxes that use Bootstrap's button plugin for a
   # toggle button effect.
-  def import_sources_checkboxes(help_block_id)
+  def import_sources_checkboxes(help_block_id, options = {})
     Gitlab::ImportSources.options.map do |name, source|
       checked = Gitlab::CurrentSettings.import_sources.include?(source)
       css_class = checked ? 'active' : ''
@@ -63,6 +64,7 @@ module ApplicationSettingsHelper
         check_box_tag(checkbox_name, source, checked,
                       autocomplete: 'off',
                       'aria-describedby' => help_block_id,
+                      'class' => options[:class],
                       id: name.tr(' ', '_')) + name
       end
     end

app/views/admin/application_settings/_visibility_and_access.html.haml

@@ -23,7 +23,7 @@
       .col-sm-10
         - checkbox_name = 'application_setting[restricted_visibility_levels][]'
         = hidden_field_tag(checkbox_name)
-        - restricted_level_checkboxes('restricted-visibility-help', checkbox_name).each do |level|
+        - restricted_level_checkboxes('restricted-visibility-help', checkbox_name, class: 'form-check-input').each do |level|
           .form-check
             = level
         %span.form-text.text-muted#restricted-visibility-help
@@ -33,7 +33,7 @@
       = f.label :import_sources, class: 'col-form-label col-sm-2'
       .col-sm-10
         = hidden_field_tag 'application_setting[import_sources][]'
-        - import_sources_checkboxes('import-sources-help').each do |source|
+        - import_sources_checkboxes('import-sources-help', class: 'form-check-input').each do |source|
           .form-check= source
         %span.form-text.text-muted#import-sources-help
           Enabled sources for code import during project creation. OmniAuth must be configured for GitHub