[FIX] hr_holidays: remove default working hours on stress days

If you create stress days, the default work calendar is set to be
the company's default calendar, therefore exclude by default
every employee with a different work calendar. Since the field
is by default hidden, it is misleading, so by default no calendar
should be set.

task-2999197

closes odoo/odoo#101986

X-original-commit: 911832980786cc10bb79c7b36b2142d063917bff
Signed-off-by: Kevin Baptiste <kba@odoo.com>

addons/hr_holidays/models/hr_leave_stress_day.py

@@ -1,8 +1,7 @@
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
-from dateutil.relativedelta import relativedelta
 from random import randint
 
-from odoo import api, fields, models
+from odoo import fields, models
 
 
 class StressDay(models.Model):
@@ -15,8 +14,9 @@ class StressDay(models.Model):
     start_date = fields.Date(required=True)
     end_date = fields.Date(required=True)
     color = fields.Integer(default=lambda dummy: randint(1, 11))
-    resource_calendar_id = fields.Many2one('resource.calendar', 'Working Hours',
-        default=lambda self: self.env.company.resource_calendar_id.id, domain="['|', ('company_id', '=', False), ('company_id', '=', company_id)]")
+    resource_calendar_id = fields.Many2one(
+        'resource.calendar', 'Working Hours',
+        domain="['|', ('company_id', '=', False), ('company_id', '=', company_id)]")
     department_ids = fields.Many2many('hr.department', string="Departments")
 
     _sql_constraints = [