[FIX] website_event: move toggle_website_menu method to website_event

toggle_website_menu (in website_event_track module) is called by website_event
set_customize_options (in website_event module). Since website_event_track is
not installed by default when website_event is installed, this function might
not be available in the event.event model. Therefore toggle_website_menu has
been moved from the event.event model in website_event_track to the event.event
model in website_event.

Followup of bd99cc24b1

Task ID 2244487
PR #51503

X-original-commit: e541efe1338f853962560db4d982821707ddc3c6

addons/website_event/models/event_event.py

@@ -168,3 +168,6 @@ class Event(models.Model):
 
     def get_backend_menu_id(self):
         return self.env.ref('event.event_main_menu').id
+
+    def toggle_website_menu(self, val):
+        self.website_menu = val

addons/website_event_track/models/event_event.py

@@ -129,9 +129,6 @@ class Event(models.Model):
         res = [(_('Talk Proposals'), '/event/%s/track_proposal' % slug(self), False, 'track_proposal')]
         return res
 
-    def toggle_website_menu(self, val):
-        self.website_menu = val
-
     def toggle_website_track(self, val):
         self.website_track = val