[IMP] web: kanban_selection widget: clean css of kanban selection widget.
[FIX] web: kanban selection and priority widget isuue: record_in not update when you nevigate from one record to another in form view, it will update the previous record not current record because record_id not update.
[IMP] web: kanban selection and priority widget: remove oe_legend class as it was used only as selector and had no other impact.