[FIX] hr_recruitment: OdooBot assigned as Applicant Responsible

When someone is applying to any job position from the website
( via the `/website_form/` route ), the `hr.applicant` record
is created by OdooBot, and in such case, the `_compute_user`
method is never triggered as the field `user_id` (Responsible)
already has self.env.uid as default value.

This fix will in priority try to set a proper Responsible (if any
is defined on the job position) via `_compute_user` and then
assign `self.env.uid` if none is found.

closes odoo/odoo#55146

X-original-commit: e9292cb424ec04823dbce964ad4532edc20190c6
Signed-off-by: Toufik Benjaa (tbe) <tbe@odoo.com>

addons/hr_recruitment/models/hr_recruitment.py

@@ -115,7 +115,7 @@ class Applicant(models.Model):
     company_id = fields.Many2one('res.company', "Company", compute='_compute_company', store=True, readonly=False, tracking=True)
     user_id = fields.Many2one(
         'res.users', "Responsible", compute='_compute_user',
-        tracking=True, default=lambda self: self.env.uid, store=True, readonly=False)
+        tracking=True, store=True, readonly=False)
     date_closed = fields.Datetime("Closed", compute='_compute_date_closed', store=True, index=True)
     date_open = fields.Datetime("Assigned", readonly=True, index=True)
     date_last_stage_update = fields.Datetime("Last Stage Update", index=True, default=fields.Datetime.now)
@@ -250,8 +250,8 @@ class Applicant(models.Model):
 
     @api.depends('job_id')
     def _compute_user(self):
-        for applicant in self.filtered(lambda a: a.job_id):
-            applicant.user_id = applicant.job_id.user_id.id
+        for applicant in self:
+            applicant.user_id = applicant.job_id.user_id.id or self.env.uid
 
     @api.depends('partner_id')
     def _compute_partner_phone_email(self):