Fix ldk-server.config

Author: G8XSU

ldk-server/ldk-server.config

@@ -18,7 +18,7 @@
   "bitcoind_rpc_user": "polaruser",
 
   // Bitcoin Core's RPC password.
-  "bitcoind_rpc_user": "polarpass",
+  "bitcoind_rpc_password": "polarpass",
 
   // RabbitMQ connection string. (only required if using RabbitMQ based events using `events-rabbitmq` feature)
   "rabbitmq_connection_string": "",