fix: advanced option tls fallback

Signed-off-by: fufesou <linlong1266@gmail.com>

src/config.rs

@@ -2713,6 +2713,7 @@ pub mod keys {
         OPTION_ENABLE_TRUSTED_DEVICES,
         OPTION_RELAY_SERVER,
         OPTION_DISABLE_UDP,
+        OPTION_ALLOW_INSECURE_TLS_FALLBACK,
     ];
 
     // BUILDIN_SETTINGS