fix: pay invoice status (#2481)

* fix: rest `pay_invoice` pending instead of failed
* fix: rpc `pay_invoice` pending instead of failed
* fix: return "failed" value for payment
* fix: handle failed status for LNbits funding source
* chore: `phoenixd` todo
* test: fix condition
* fix: wait for payment status to be updated
* fix: fail payment when explicit status provided

---------

Co-authored-by: dni ⚡ <office@dnilabs.com>

lnbits/wallets/lndgrpc.py

@@ -167,7 +167,7 @@ class LndWallet(Wallet):
             resp = await self.routerpc.SendPaymentV2(req).read()
         except Exception as exc:
             logger.warning(exc)
-            return PaymentResponse(False, None, None, None, str(exc))
+            return PaymentResponse(None, None, None, None, str(exc))
 
         # PaymentStatus from https://github.com/lightningnetwork/lnd/blob/master/channeldb/payments.go#L178
         statuses = {