Fix a few things in demo

- OpenVPN: Set default gateway
- WireGuard: "Connect" button not updated

Demo/Demo/Configuration.swift

@@ -182,6 +182,7 @@ M69t86apMrAxkUxVJAWLRBd9fbYyzJgTW61tFqXWTZpiz6bhuWApSEzaHcL3/f5l
             builder.clientCertificate = clientCertificate
             builder.clientKey = clientKey
             builder.mtu = 1350
+            builder.routingPolicies = [.IPv4, .IPv6]
             let cfg = builder.build()
 
             var providerConfiguration = OpenVPN.ProviderConfiguration(title, appGroup: appGroup, configuration: cfg)

Demo/Demo/iOS/WireGuardViewController.swift

@@ -131,6 +131,7 @@ class WireGuardViewController: UIViewController {
     }
     
     @objc private func VPNStatusDidChange(notification: Notification) {
+        vpnStatus = notification.vpnStatus
         print("VPNStatusDidChange: \(notification.vpnStatus)")
         updateButton()
     }