Set new LN defaults (#3325)

fixes #3324

BTCPayServer/Controllers/UIStoresController.LightningLike.cs

@@ -164,6 +164,13 @@ namespace BTCPayServer.Controllers
                     var lnurl = new PaymentMethodId(vm.CryptoCode, PaymentTypes.LNURLPay);
                     store.SetStoreBlob(storeBlob);
                     store.SetSupportedPaymentMethod(paymentMethodId, paymentMethod);
+                    store.SetSupportedPaymentMethod(lnurl, new LNURLPaySupportedPaymentMethod()
+                    {
+                        CryptoCode = vm.CryptoCode,
+                        UseBech32Scheme = true,
+                        EnableForStandardInvoices = false,
+                        LUD12Enabled = false
+                    });
 
                     await _Repo.UpdateStore(store);
                     TempData[WellKnownTempData.SuccessMessage] = $"{network.CryptoCode} Lightning node updated.";