[FIX] web: save date(time) field value on key enter in editable list

In editable list, on keypress enter, the _next method is called, saving the current line and starting the edition of the next one
The _next is triggered before the date(time) field change event, and, therefore, the saved value of the date(time) field is the old one
Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-win32