fix lndrest payment checking: b64/hex mismatch.

finally fixes https://github.com/lnbits/lnbits/issues/55
and https://github.com/lnbits/lnbits/issues/110

lnbits/wallets/lndrest.py

@@ -131,6 +131,10 @@ class LndRestWallet(Wallet):
         # https://api.lightning.community/rest/index.html?python#peersynctype
         statuses = {"UNKNOWN": None, "IN_FLIGHT": None, "SUCCEEDED": True, "FAILED": False}
 
+        # for some reason our checking_ids are in base64 but the payment hashes
+        # returned here are in hex, lnd is weird
+        checking_id = base64.b64decode(checking_id).hex()
+
         for p in r.json()["payments"]:
             if p["payment_hash"] == checking_id:
                 return PaymentStatus(statuses[p["status"]])