[FIX] calendar: notification widget new API
[FIX] calendar: notification widget new API

Before this commit, when having a calendar notification, the buttons to snooze/cancel
This was because the API of the widget notification changed with 07cd24b1ecf3ab8edd3fffbf2fcd3a3e685f357c
The widget "text" has been changed to "message"

After this commit, the buttons are present and work

OPW 1923132

closes odoo/odoo#30946
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo