Set danger variant and label to destroy oauth app

Changelog: changed

app/views/shared/doorkeeper/applications/_delete_form.html.haml

@@ -2,9 +2,9 @@
 = form_tag path do
   %input{ :name => "_method", :type => "hidden", :value => "delete" }
   - if defined? small
-    = button_tag type: "submit", class: "gl-button btn btn-danger btn-icon", data: { confirm: _("Are you sure?") } do
+    = button_tag type: "submit", class: "gl-button btn btn-danger btn-icon", data: { confirm: _("Are you sure?"), confirm_btn_variant: "danger" } do
       %span.sr-only
         = _('Destroy')
       = sprite_icon('remove')
   - else
-    = submit_tag _('Destroy'), data: { confirm: _("Are you sure?") }, class: submit_btn_css
+    = submit_tag _('Destroy'), data: { confirm: _("Are you sure?"), confirm_btn_variant: "danger" }, aria: { label: _('Destroy') }, class: submit_btn_css