[REV] mail: get current company activities

This reverts commit c071f0255fba3b8340182607fe4ef70321691341
(See PR https://github.com/odoo/odoo/pull/64201)

Reason: the fix is incorrect, it creates another issue:
https://github.com/odoo/odoo/issues/64548



closes odoo/odoo#64597

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/mail/static/src/js/systray/systray_activity_menu.js

@@ -131,13 +131,7 @@ var ActivityMenu = Widget.extend({
             res_model:  data.res_model,
             views: [[false, 'kanban'], [false, 'form']],
             search_view_id: [false],
-            domain: [
-                ['activity_user_id', '=', session.uid],
-                // filter activities on current company
-                '|',
-                ['company_id', '=', false],
-                ['company_id', 'child_of', [session.company_id]]
-            ],
+            domain: [['activity_user_id', '=', session.uid]],
             context:context,
         }, {
             clear_breadcrumbs: true,