fix(forum): ab test forum rating (#687)

## Description

🎸 correction `id` de la zone mise à jour

## Type de changement

🪲 Correction de bug (changement non cassant qui corrige un problème).


### Points d'attention

🦺 pour tester en local 
*
http://127.0.0.1:8000/forum/conception-dun-atelier-favorisant-linsertion-professionnelle-des-publics-141/?pk_ab_test=original
*
http://127.0.0.1:8000/forum/conception-dun-atelier-favorisant-linsertion-professionnelle-des-publics-141/?pk_ab_test=rating_area_2
*
http://127.0.0.1:8000/forum/conception-dun-atelier-favorisant-linsertion-professionnelle-des-publics-141/?pk_ab_test=rating_area_3

lacommunaute/templates/forum/forum_detail.html

@@ -198,14 +198,14 @@ <h1>{{ forum.name }}</h1>
             {
                 name: 'rating_area_2', // you can also use '13' (ID of the variation) to hide the name
                 activate: function(event) {
-                    $("#rating_area2").removeClass("d-none")
-                    $("#rating_area1").addClass("d-none")
+                    $("#rating-area2").removeClass("d-none")
+                    $("#rating-area1").addClass("d-none")
                 }
             },                        {
                 name: 'rating_area_3', // you can also use '14' (ID of the variation) to hide the name
                 activate: function(event) {
-                    $("#rating_area3").removeClass("d-none")
-                    $("#rating_area1").addClass("d-none")
+                    $("#rating-area3").removeClass("d-none")
+                    $("#rating-area1").addClass("d-none")
                 }
             }
         ],