[REF] survey: clean useless .decode('utf-8') calls

This commit cleans some useless .decode('utf-8') calls when we return rendered
templates results in the survey controllers.

The http module is capable of handling that type of results and the calls were
not necessary / added complexity.

Task '2187328'

closes odoo/odoo#44540

Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/survey/controllers/main.py

@@ -329,8 +329,8 @@ class Survey(http.Controller):
         and send back this html to the survey_form widget that will inject it into the page."""
         data = self._prepare_survey_data(survey_sudo, answer_sudo, **post)
         if answer_sudo.state == 'done':
-            return request.env.ref('survey.survey_fill_form_done').render(data).decode('UTF-8')
-        return request.env.ref('survey.survey_fill_form_in_progress').render(data).decode('UTF-8')
+            return request.env.ref('survey.survey_fill_form_done').render(data)
+        return request.env.ref('survey.survey_fill_form_in_progress').render(data)
 
     @http.route('/survey/<string:survey_token>/<string:answer_token>', type='http', auth='public', website=True)
     def survey_display_page(self, survey_token, answer_token, **post):

addons/survey/controllers/survey_session_manage.py

@@ -58,7 +58,7 @@ class UserInputSession(http.Controller):
         survey._session_trigger_next_question()
         template_values = self._prepare_manage_session_values(survey)
         template_values['is_rpc_call'] = True
-        return request.env.ref('survey.user_input_session_manage_content').render(template_values).decode('UTF-8')
+        return request.env.ref('survey.user_input_session_manage_content').render(template_values)
 
     @http.route('/survey/session/results/<string:survey_token>', type='json', auth='user', website=True)
     def survey_session_results(self, survey_token, **kwargs):
@@ -86,7 +86,7 @@ class UserInputSession(http.Controller):
             'survey': survey,
             'question': survey.session_question_id,
             'question_data': question_statistics,
-        }).decode('UTF-8')
+        })
 
     @http.route('/survey/session/ranking/<string:survey_token>', type='json', auth='user', website=True)
     def survey_session_ranking(self, survey_token, **kwargs):
@@ -104,7 +104,7 @@ class UserInputSession(http.Controller):
         return request.env.ref('survey.user_input_session_ranking').render({
             'animate_width': True,
             'ranking': survey._prepare_ranking_values()
-        }).decode('UTF-8')
+        })
 
     def _prepare_manage_session_values(self, survey):
         is_last_question = False