Fix duplication between tree_header and tree_content

app/views/projects/tree/_tree_content.html.haml

-.gray-content-block
-  %ul.breadcrumb.repo-breadcrumb
-    %li
-      = link_to namespace_project_tree_path(@project.namespace, @project, @ref) do
-        = @project.path
-    - tree_breadcrumbs(tree, 6) do |title, path|
-      %li
-        - if path
-          = link_to truncate(title, length: 40), namespace_project_tree_path(@project.namespace, @project, path)
-        - else
-          = link_to title, '#'
-    - if allowed_tree_edit?
-      %li
-        %span.dropdown
-          %a.dropdown-toggle.btn.add-to-tree{href: '#', "data-toggle" => "dropdown"}
-            = icon('plus')
-          %ul.dropdown-menu
-            %li
-              = link_to namespace_project_new_blob_path(@project.namespace, @project, @id), title: 'Create file', id: 'new-file-link' do
-                = icon('pencil fw')
-                Create file
-            %li
-              = link_to '#modal-upload-blob', { 'data-target' => '#modal-upload-blob', 'data-toggle' => 'modal'} do
-                = icon('file fw')
-                Upload file
-            %li.divider
-            %li
-              = link_to '#modal-create-new-dir', { 'data-target' => '#modal-create-new-dir', 'data-toggle' => 'modal'} do
-                = icon('folder fw')
-                New directory
-
 %div.tree-content-holder
   .table-holder
     %table.table#tree-slider{class: "table_#{@hex_path} tree-table table-striped" }