Missing select2 and fancybox resources when using wro servlet

When displaying a select2, some img resources are missing since theme removal:

• http://localhost:8080/nuxeo/wapi/v1/resource/img/select2.png Failed to load resource: the server responded with a status of 404 (Not Found)

If you look closely, you'll see that none of the select2 style pictures are displayed (arrow to expand the suggest box, cross to delete selection, etc...)

Simillar issues with fancybox icons.

This is due to bad resource detection // uri replacement in wro servlet.