Fix insert 'insert a link to a Nuxeo document'

Since Tiny mce upgrade, 'Insert a link to a Nuxeo Document' seems broken.

To reproduce:

• create a Note
• Click 'Insert a link to a Nuxeo Document'
• a popup opens
• click on search
• we get a 'Sorry, the page you requested cannot be found.' page

In server.log:

15:04:34,336 WARN  [StaticNavigationHandler] Guessing view id for outcome 'test_popup': use '/test_popup.faces'