[FIX] FieldBoolean: allow click event to propagate the value to the model in all cases
[FIX] FieldBoolean: allow click event to propagate the value to the model in all cases

If not done, once a boolean field becomes invalid, it cannot
be made valid again in any way.
This seems to be coherent with the way change events are
handled in other widgets, like TextArea.

havt/openerp-web,akretion/openerp-web,havt/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web,akretion/openerp-web,havt/openerp-web