Remove double % signs.

Double %% symbols in ADDRESS_FORMAT_LAYOUTS break the CSS because they are never parsed and end up appearing as double instead of single % symbols after replacing the `<div class="addres_format">`.

To check this bug, you must set up a country in you user's company. I used Spain, if it matters. Then, go to create new partner and see that it has this format:

![captura de pantalla de 2014-12-05 10 29 36](https://cloud.githubusercontent.com/assets/973709/5313517/bbeb7f9e-7c69-11e4-8ed1-cc8e6c04a5b7.png)

Instead of this other (the correct one):

![captura de pantalla de 2014-12-05 10 29 51](https://cloud.githubusercontent.com/assets/973709/5313519/c1446f1e-7c69-11e4-8b54-94e2bd286649.png)