fix link query string

app/views/learning_objects/build/_file_upload_form.html.erb

@@ -40,7 +40,7 @@
     <div id="results" class="panel"></div>
 
     <div class="large-12 columns">
-      <%= link_to @learning_object, {preview_product: true} do %>
+      <%= link_to learning_object_path(@learning_object, preview_product: true) do %>
           <button type="submit" class="btn-submit btn btn-primary btn-outline-rounded blue">
             Pré-visualizar <i style="margin-left:10px;" class="fa fa-eye"></i></button>
       <% end %>