Remove locals from tree/submodule_item, use "object" instead

app/views/tree/_submodule_item.html.haml

-- url = content.url(@ref) rescue nil
-- name = content.basename
+- url = submodule_item.url(@ref) rescue nil
+- name = submodule_item.basename
 - return unless url
 %tr{ class: "tree-item", url: url }
   %td.tree-item-file-name
     = image_tag "submodule.png"
     %strong= truncate(name, length: 40)
   %td
-    %code= content.id[0..10]
+    %code= submodule_item.id[0..10]
   %td
     = link_to truncate(url, length: 40), url
-
-