FIx JS bug with select2 because of missing `data-field` attribute in select box.

app/views/projects/edit.html.haml

@@ -91,7 +91,7 @@
                     Git Large File Storage
                     = link_to icon('question-circle'), help_page_path('workflow/lfs/manage_large_binaries_with_git_lfs')
                 .col-md-3
-                  = f.select :lfs_enabled, [%w(Enabled true), %w(Disabled false)], {}, selected: @project.lfs_enabled?, class: 'pull-right form-control'
+                  = f.select :lfs_enabled, [%w(Enabled true), %w(Disabled false)], {}, selected: @project.lfs_enabled?, class: 'pull-right form-control', data: { field: 'lfs_enabled' }
 
           - if Gitlab.config.registry.enabled
             .form-group