[FIX] survey: download certificate as portal user

A portal user couldn't download a survey certificate

Steps to reproduce:
1. Install the Survey app and open it
2. Create a survey with a scoring and a certificate and copy the link
3. In an incognito tab, connect as portal and go to the survey
4. After completing the survey, try to download the certificate

Solution:
Change the call 'sudo()' to 'with_user(SUPERUSER_ID)'

OPW-2687625

closes odoo/odoo#81957

X-original-commit: 962919ec878b4e93b4dd8f01f029ce1366976d9b
Signed-off-by: Grazioso Andrea (agr) <agr@odoo.com>
Signed-off-by: Guillaume Merlin (megu) <megu@odoo.com>

addons/survey/controllers/main.py

@@ -8,7 +8,7 @@ import werkzeug
 from datetime import datetime, timedelta
 from dateutil.relativedelta import relativedelta
 
-from odoo import fields, http, _
+from odoo import fields, http, SUPERUSER_ID, _
 from odoo.addons.base.models.ir_ui_view import keep_query
 from odoo.exceptions import UserError
 from odoo.http import request, content_disposition
@@ -668,7 +668,7 @@ class Survey(http.Controller):
         return request.render('survey.survey_page_statistics', template_values)
 
     def _generate_report(self, user_input, download=True):
-        report = request.env.ref('survey.certification_report').sudo()._render_qweb_pdf([user_input.id], data={'report_type': 'pdf'})[0]
+        report = request.env.ref('survey.certification_report').with_user(SUPERUSER_ID)._render_qweb_pdf([user_input.id], data={'report_type': 'pdf'})[0]
 
         report_content_disposition = content_disposition('Certification.pdf')
         if not download: