[FIX] bus: use `||` instead of `|`

Revision on https://github.com/odoo/odoo/commit/221f469045e32b3bd8bb975dad4467424602cefa

addons/bus/static/src/js/crosstab_bus.js

@@ -304,7 +304,7 @@ var CrossTabBus = Longpolling.extend({
 
         // last notification id changed
         if (key === this._generateKey('last')) {
-            this._lastNotificationID = value | 0;
+            this._lastNotificationID = value || 0;
         }
         // notifications changed
         else if (key === this._generateKey('notification')) {