Fix the border style of CONTRIBUTING button when it exists

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

app/presenters/project_presenter.rb

@@ -256,7 +256,8 @@ class ProjectPresenter < Gitlab::View::Presenter::Delegated
     elsif repository.contribution_guide.present?
       AnchorData.new(false,
                      statistic_icon('doc-text') + _('CONTRIBUTING'),
-                     contribution_guide_path)
+                     contribution_guide_path,
+                     'default')
     end
   end
 

changelogs/unreleased/57564-contributing-button-border.yml

+---
+title: Fix the border style of CONTRIBUTING button when it exists
+merge_request: 25124
+author: Takuya Noguchi
+type: fixed