fix uploads restorer missing path

lib/gitlab/import_export/uploads_restorer.rb

@@ -22,6 +22,10 @@ module Gitlab
       def uploads_path
         FileUploader.absolute_base_dir(@project)
       end
+
+      def uploads_export_path
+        @uploads_export_path ||= File.join(@shared.export_path, 'uploads')
+      end
     end
   end
 end