fix: Preserve disable_sym_hole_punching setting on edit (#1589)

easytier/src/launcher.rs

@@ -882,6 +882,7 @@ impl NetworkConfig {
         result.proxy_forward_by_system = Some(flags.proxy_forward_by_system);
         result.disable_encryption = Some(!flags.enable_encryption);
         result.disable_udp_hole_punching = Some(flags.disable_udp_hole_punching);
+        result.disable_sym_hole_punching = Some(flags.disable_sym_hole_punching);
         result.enable_magic_dns = Some(flags.accept_dns);
         result.mtu = Some(flags.mtu as i32);
         result.enable_private_mode = Some(flags.private_mode);