[FIX] event: propagate use of correct default_auto_confirmation key

Fix a14bdbd4be made event correctly use
default_auto_confirmation key. However since commit bf82638bb0
tests were also not correctly using the ir values key.

This commit should fix all use of that key. Maybe.

addons/event/tests/test_event_flow.py

@@ -71,7 +71,7 @@ class TestEventFlow(TestEventCommon):
     def test_10_advanced_event_flow(self):
         """ Avanced event flow: no auto confirmation, manage minimum / maximum
         seats, ... """
-        self.env['ir.values'].set_default('event.config.settings', 'auto_confirmation', False)
+        self.env['ir.values'].set_default('event.config.settings', 'default_auto_confirmation', False)
 
         # EventUser creates a new event: ok
         test_event = self.Event.sudo(self.user_eventmanager).create({

addons/event/tests/test_mail_schedule.py

@@ -13,7 +13,7 @@ class TestMailSchedule(TestEventCommon):
     @mute_logger('odoo.addons.base.ir.ir_model', 'odoo.models')
     def test_00_event_mail_schedule(self):
         """ Test mail scheduling for events """
-        self.env['ir.values'].set_default('event.config.settings', 'auto_confirmation', True)
+        self.env['ir.values'].set_default('event.config.settings', 'default_auto_confirmation', True)
         now = fields.datetime.now()
         event_date_begin = now + relativedelta(days=1)
         event_date_end = now + relativedelta(days=3)