fix the ui update when adding an emoji

src/plugins/sib-reactions.js

@@ -91,8 +91,16 @@ converse.plugins.add('sib-reactions', {
 
       // Force UI update in the model
       if (update) {
+        const from_real_jid = _converse.bare_jid;
+        const reactions = message.get('reactions') || {};
+        reactions[from_real_jid] = {
+          emojis,
+          origin_id: reactions[from_real_jid] || null,
+          from_real_jid,
+        };
+
         message.set('reactions', {}); // Forces refresh
-        message.save('reactions', emojis);
+        message.save('reactions', reactions);
       }
 
       // TODO: Remove