[FIX] bus: restart poll just after abort

Fix regression introduced with e0ed7b12ca

Issue without current commit:

When doing `abort` next updates from the bus are only received after the normal
timeout, which makes the interface unresponsive to updates during that amount of
time.

`abort` is for example called during `addChannel`, where it is specifically
documented that new updates are to be received immediately.

closes odoo/odoo#49355

X-original-commit: 888610e5e07794e000ef27edcb075cb45c1e2ccc
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/bus/static/src/js/longpolling_bus.js

@@ -191,7 +191,7 @@ var LongpollingBus = Bus.extend(ServicesMixin, {
             self._pollRpc = false;
             // no error popup if request is interrupted or fails for any reason
             result.event.preventDefault();
-            if (result.message && result.message.message === "XmlHttpRequestError abort") {
+            if (result.message === "XmlHttpRequestError abort") {
                 self._poll();
             } else {
                 // random delay to avoid massive longpolling