fix: update LNBits payment request handling

- Changed the response handling in the newAddress function to return the bolt11 invoice instead of the payment request.
- Updated error message to reflect the change in response structure from LNBits.

packages/server/lib/plugins/wallet/lnbits/lnbits.js

@@ -93,11 +93,11 @@ async function newAddress(account, info, tx) {
   const endpoint = `${account.endpoint}/api/v1/payments`
   const result = await request(endpoint, 'POST', invoiceData, account.adminKey)
   
-  if (!result.payment_request) {
-    throw new Error('LNBits did not return a payment request')
+  if (!result.bolt11) {
+    throw new Error('LNBits did not return a bolt11 invoice')
   }
   
-  return result.payment_request
+  return result.bolt11
 }
 
 async function getStatus(account, tx) {