[FIX] survey: don't disclose the survey via print

To avoid bigger changes, only verify if the login is required.
A proper refactoring has been implemented in master at 9771fdfe

Closes odoo/odoo#30166

addons/survey/controllers/main.py

@@ -252,6 +252,10 @@ class WebsiteSurvey(http.Controller):
     def print_survey(self, survey, token=None, **post):
         '''Display an survey in printable view; if <token> is set, it will
         grab the answers of the user_input_id that has <token>.'''
+
+        if survey.auth_required and request.env.user == request.website.user_id:
+            return request.render("survey.auth_required", {'survey': survey, 'token': token})
+
         return request.render('survey.survey_print',
                                       {'survey': survey,
                                        'token': token,