[FIX] base: crons Work Days option

As you can see from the code,
choosing "Work days" or "days" as internval
has exactly the same behavior.

Users might nevertheless expect the interval
"work days" option to avoid running the
action on non-working days, such as
Saturdays and Sundays.

It may have been intended, but it never
worked, since revision 1:
https://github.com/odoo/odoo/blob/004a0b996ff8f269451e07346f71a129a1f3fbaf/bin/addons/base/ir/ir_cron.py#L49-L50

opw-693882

odoo/addons/base/ir/ir_cron.py

@@ -22,7 +22,6 @@ def str2tuple(s):
     return safe_eval('tuple(%s)' % (s or ''))
 
 _intervalTypes = {
-    'work_days': lambda interval: relativedelta(days=interval),
     'days': lambda interval: relativedelta(days=interval),
     'hours': lambda interval: relativedelta(hours=interval),
     'weeks': lambda interval: relativedelta(days=7*interval),
@@ -49,7 +48,6 @@ class ir_cron(models.Model):
     interval_number = fields.Integer(default=1, help="Repeat every x.")
     interval_type = fields.Selection([('minutes', 'Minutes'),
                                       ('hours', 'Hours'),
-                                      ('work_days', 'Work Days'),
                                       ('days', 'Days'),
                                       ('weeks', 'Weeks'),
                                       ('months', 'Months')], string='Interval Unit', default='months')