[FIX] calendar: recurrent event no longer working

Creating a recurrent event was no longer displaying
all recurring events in the calendar, only the base
event.

This is following odoo/odoo@9920f20e4c7753bc17bea71dea3a90f7de687196

closes odoo/odoo#35919

Signed-off-by: Denis Ledoux <beledouxdenis@users.noreply.github.com>