update node constants, follow up to #3592 (#3593)

update node constants, this was forgotten in #3592
not a big deal as these are generated on building node,
so this is just a simple commit of these files after running `npm run build`

node/events.js

@@ -30,5 +30,6 @@ module.exports = {
   2061: 'DC_EVENT_SECUREJOIN_JOINER_PROGRESS',
   2100: 'DC_EVENT_CONNECTIVITY_CHANGED',
   2110: 'DC_EVENT_SELFAVATAR_CHANGED',
-  2120: 'DC_EVENT_WEBXDC_STATUS_UPDATE'
+  2120: 'DC_EVENT_WEBXDC_STATUS_UPDATE',
+  2121: 'DC_EVENT_WEBXDC_INSTANCE_DELETED'
 }