[mailman3] Use lists.crans.org as web entrypoint

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

group_vars/reverseproxy.yml

@@ -43,7 +43,7 @@ glob_reverseproxy:
     - {from: owncloud.crans.org, to: 172.16.10.136}
     - {from: linx.crans.org, to: "172.16.10.119:8080"}
     - {from: belenios.crans.org, to: 172.16.10.111}
-    - {from: mailman.crans.org, to: 172.16.10.110}
+    - {from: lists.crans.org, to: 172.16.10.110}
 
     # Zamok
     - {from: perso.crans.org, to: 172.16.10.31}