change the default value for naming rules

WebAdmin does not work properly is trimming trailing and leading white
spaces is disabled

Fixes #1119

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

sftpgo.json

@@ -237,7 +237,7 @@
     "password_caching": true,
     "update_mode": 0,
     "create_default_admin": false,
-    "naming_rules": 1,
+    "naming_rules": 5,
     "is_shared": 0,
     "node": {
       "host": "",