bugfix: fix origin_id on ui update

src/plugins/sib-reactions.js

@@ -90,7 +90,7 @@ converse.plugins.add('sib-reactions', {
         const reactions = message.get('reactions') || {};
         reactions[from_real_jid] = {
           emojis,
-          origin_id: reactions[from_real_jid] || null,
+          origin_id: reactions[from_real_jid]?.origin_id || null,
           from_real_jid,
         };