[IMP] hr_recruitment: remove default responsible in applicant

Steps:
 - install hr_recruitment app
 - Create a job Positions without Recruiter
 - Published job Positions
 - Got To website and apply
 - Open applicant
 - Public user is set in applicant responsible

Issue:
   public user is set if Recruiter is empty in job Position

Fix:
   In this commit we have removed the default current user as the responsible
  applicant.

task-3424017

closes odoo/odoo#128721

Signed-off-by: Sofie Gvaladze (sgv) <sgv@odoo.com>

addons/hr_recruitment/models/hr_applicant.py

@@ -249,7 +249,7 @@ class Applicant(models.Model):
     @api.depends('job_id')
     def _compute_user(self):
         for applicant in self:
-            applicant.user_id = applicant.job_id.user_id.id or self.env.uid
+            applicant.user_id = applicant.job_id.user_id.id
 
     @api.depends('partner_id')
     def _compute_partner_phone_email(self):