[FIX] correctly save group_by context key when saving a search to a dashboard
[FIX] correctly save group_by context key when saving a search to a dashboard

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