Fix document save in a toggleable layout after a validation error

Drop the attach file to nxserver/config and restart Nuxeo. Then follow these steps:

1. Create a Note
2. Go to MyTab tab
3. Delete the title and click on the Modify button
4. A validation error is displayed and the title is filled with the previous value
5. Change the description and click on the Modify button
6. The document is successfully saved but the description is not changed

Setting "Use ajax actions" to YES in the definition of the toggleable layout makes it work as expected.