Add btn-default to settings toggle button in push rules

changelogs/unreleased/btn-default-push-rules.yml

+---
+title: Add btn-default to settings toggle button in push rules
+merge_request: 52430
+author: Yogi (@yo)
+type: other

ee/app/views/admin/push_rules/_merge_request_approvals.html.haml

@@ -3,7 +3,7 @@
   .settings-header
     %h4
       = _('Merge request (MR) approvals')
-    %button.btn.gl-button.js-settings-toggle{ type: 'button' }
+    %button.btn.gl-button.btn-default.js-settings-toggle{ type: 'button' }
       = expanded_by_default? ? _('Collapse') : _('Expand')
     %p
       = _('Regulate approvals by authors/committers. Affects all projects.')

ee/app/views/admin/push_rules/show.html.haml

@@ -6,7 +6,7 @@
   .settings-header
     %h4
       = _('Push Rules')
-    %button.btn.gl-button.js-settings-toggle{ type: 'button' }
+    %button.btn.gl-button.btn-default.js-settings-toggle{ type: 'button' }
       = expanded_by_default? ? _('Collapse') : _('Expand')
     %p
       = _('Rules that define what git pushes are accepted for a project. All newly created projects will use these settings.')