Issue #3432104: Dislike button not working

Make the dislike button work by adding a 'data-entity-op' attribute to the link that specifies the operation to perform (like or dislike).

js/like_and_dislike.js

@@ -22,12 +22,13 @@
         $widget.find('.vote-like, .vote-dislike').on({
           keyup: function(event) {
             if (event.which !== 13 && event.which !==32) return;
-            updateWidget('like', $(this).find('a'));
+            let elm = $(this).find('a');
+            updateWidget(elm.data('entity-op'), elm);
           }
         });
         $widget.find('.vote-like a, .vote-dislike a').on({
           click: function() {
-            updateWidget('like', $(this));
+            updateWidget($(this).data('entity-op'), $(this));
           },
         });
       });