Fix misaligned edit button in milestone collection partial

app/views/projects/milestones/_milestone.html.haml

@@ -21,10 +21,11 @@
       = render 'shared/milestone_expired', milestone: milestone
     .col-sm-6
       - if can?(current_user, :admin_milestone, milestone.project) and milestone.active?
-        = link_to edit_namespace_project_milestone_path(milestone.project.namespace, milestone.project, milestone), class: "btn btn-xs edit-milestone-link btn-grouped" do
-          %i.fa.fa-pencil-square-o
+        = link_to edit_namespace_project_milestone_path(milestone.project.namespace, milestone.project, milestone), class: "btn btn-xs" do
+          = icon('pencil-square-o')
           Edit
+        \
         = link_to 'Close Milestone', namespace_project_milestone_path(@project.namespace, @project, milestone, milestone: {state_event: :close }), method: :put, remote: true, class: "btn btn-xs btn-close"
         = link_to namespace_project_milestone_path(milestone.project.namespace, milestone.project, milestone), data: { confirm: 'Are you sure?' }, method: :delete, class: "btn btn-xs btn-remove" do
-          %i.fa.fa-trash-o
+          = icon('trash-o')
           Delete