Don't show "Set up a Lightning node" when LN is not supported (#3935)

See discussion here: https://github.com/btcpayserver/btcpayserver/discussions/3868

BTCPayServer/Models/StoreViewModels/StoreDashboardViewModel.cs

@@ -10,6 +10,7 @@ public class StoreDashboardViewModel
     public string StoreName { get; set; }
     public bool WalletEnabled { get; set; }
     public bool LightningEnabled { get; set; }
+    public bool LightningSupported { get; set; }
     public bool IsSetUp { get; set; }
     public List<AppData> Apps { get; set; } = new();
 }