[password-resets] Use a built-in module instead

[Andrea Veri <averi src gnome org>]

commit d76252b3b20d43c51b70b3d284cc89b4d4b892b4
Author: Andrea Veri <averi redhat com>
Date:   Wed Sep 1 18:06:18 2021 +0200

    Use a built-in module instead

 app.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/app.py b/app.py
index c9f7d61..683c23c 100644
--- a/app.py
+++ b/app.py
@@ -54,8 +54,7 @@ def form_post(request: Request, username: str = Form(...)):
 
     mail = glu.get_attributes_from_ldap(username, 'mail')
     if mail:
-        from itertools import chain
-        infrateam = chain(glu.get_group_from_ldap('accounts'), glu.get_group_from_ldap('sysadmin'), \
+        infrateam = list(set.union(glu.get_group_from_ldap('accounts'), glu.get_group_from_ldap('sysadmin'), 
\
                           glu.get_group_from_ldap('admins'))
 
         if username not in infrateam: