[FIX] event: fix traceback while downloading ics file

Currently while downloading ics for an event, it gives
traceback due to improper handling of kwargs.

It was introduced from https://github.com/odoo/odoo/commit/a03faab03fdf8a164c2f1298cc138b3fa83b0bea

This commit fixes the issue by properly handling
kwargs in the method definition.

task-1938637

closes odoo/odoo#32750

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/event/controllers/main.py

@@ -9,7 +9,7 @@ from odoo.http import Controller, request, route, content_disposition
 class EventController(Controller):
 
     @route(['''/event/<model("event.event", "[('state', 'in', ('confirm', 'done'))]"):event>/ics'''], type='http', auth="public")
-    def event_ics_file(self, event):
+    def event_ics_file(self, event, **kwargs):
         if not event or not event.registration_ids:
             return request.not_found()
         files = event._get_ics_file()