[FIX] core: regenerate user groups view after forcing demo data

Since
https://github.com/odoo/odoo/commit/8a3e1a0ccdad25ba5b4b99639bdaeb9073a27f1f,
`_update_user_groups_view` is called only once per module installation. However,
module installation is not the only scenario when data files are loaded and
hence we need to add the method call.

---

opw-2602541

closes odoo/odoo#76869

X-original-commit: a46d20c89c24a4e60faef09cf8ad7721bd29d6cc
Signed-off-by: Raphael Collet (rco) <rco@openerp.com>

odoo/modules/loading.py

@@ -117,6 +117,7 @@ def force_demo(cr):
 
     env = api.Environment(cr, SUPERUSER_ID, {})
     env['ir.module.module'].invalidate_cache(['demo'])
+    env['res.groups']._update_user_groups_view()
 
 
 def load_module_graph(cr, graph, status=None, perform_checks=True,