[FIX] website_slides: fix vote widget

Fix route of vote widget. Set it to auth=public so that instead of a crash
we have correct popup asking to login. Better than a SessionException, which
will not be displayed.

Another fix is done to avoid having one widget for all displayed like / dislike
buttons. Each slide should have its own vote widget.

Commit linked to task ID 1941250 and PR #31317.

addons/website_slides/controllers/main.py

@@ -538,7 +538,7 @@ class WebsiteSlides(WebsiteProfile):
         }
 
     # JSONRPC
-    @http.route('/slides/slide/like', type='json', auth="user", website=True)
+    @http.route('/slides/slide/like', type='json', auth="public", website=True)
     def slide_like(self, slide_id, upvote):
         if request.website.is_public_user():
             return {'error': 'public_user'}

addons/website_slides/static/src/js/slides_like.js

@@ -86,8 +86,11 @@ sAnimations.registry.websiteSlidesLike = sAnimations.Class.extend({
      * @param {Object} parent
      */
     start: function () {
+        var self = this;
         var defs = [this._super.apply(this, arguments)];
-        defs.push(new LikeButton(this).attachTo($('.o_wslides_like')));
+        $('.o_wslides_like').each(function () {
+            defs.push(new LikeButton(self).attachTo($(this)));
+        });
         return $.when.apply($, defs);
     },
 });