Update spacing edit button admin page

MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/57151

app/views/admin/users/_head.html.haml

@@ -22,7 +22,7 @@
     - if impersonation_enabled? && @user != current_user && @user.can?(:log_in)
       = link_to 'Impersonate', impersonate_admin_user_path(@user), method: :post, class: "btn btn-info gl-button btn-grouped", data: { qa_selector: 'impersonate_user_link' }
     = link_to edit_admin_user_path(@user), class: "btn btn-default gl-button btn-grouped" do
-      = sprite_icon('pencil-square', css_class: 'gl-icon')
+      = sprite_icon('pencil-square', css_class: 'gl-icon gl-button-icon')
       = _('Edit')
 %hr
 %ul.nav-links.nav.nav-tabs

changelogs/unreleased/update-admin-edit-button-icon.yml

+---
+title: Update admin edit button icon class
+merge_request: 57151
+author:
+type: fixed