Replace fa-pencil with GitLab SVG icon

app/views/projects/triggers/_trigger.html.haml

@@ -31,7 +31,7 @@
     - revoke_trigger_confirmation = "By revoking a trigger you will break any processes making use of it. Are you sure?"
     - if can?(current_user, :admin_trigger, trigger)
       = link_to edit_project_trigger_path(@project, trigger), method: :get, title: "Edit", class: "btn btn-default btn-sm" do
-        %i.fa.fa-pencil
+        = sprite_icon('pencil')
     - if can?(current_user, :manage_trigger, trigger)
       = link_to project_trigger_path(@project, trigger), data: { confirm: revoke_trigger_confirmation }, method: :delete, title: "Revoke", class: "btn btn-default btn-warning btn-sm btn-trigger-revoke" do
         %i.fa.fa-trash