fix star button icon alignment

app/views/projects/buttons/_star.html.haml

 - if current_user
   = link_to toggle_star_namespace_project_path(@project.namespace, @project), { class: 'btn star-btn toggle-star has-tooltip', method: :post, remote: true, title: current_user.starred?(@project) ? 'Unstar project' : 'Star project' } do
     - if current_user.starred?(@project)
-      = icon('star fw')
+      = icon('star')
       %span.starred Unstar
     - else
-      = icon('star-o fw')
+      = icon('star-o')
       %span Star
   %div.count-with-arrow
     %span.arrow
@@ -13,7 +13,7 @@
 
 - else
   = link_to new_user_session_path, class: 'btn has-tooltip star-btn', title: 'You must sign in to star a project' do
-    = icon('star fw')
+    = icon('star')
     Star
   %div.count-with-arrow
     %span.arrow