Fix GDB getter

Reviewers: dgleich

Reviewed By: dgleich

Differential Revision: https://phabricator.memgraph.io/D1149

src/database/graph_db.cpp

@@ -157,7 +157,7 @@ class Worker : public PrivateBase {
   IMPL_DISTRIBUTED_GETTERS
   distributed::PlanConsumer &plan_consumer() override { return plan_consumer_; }
   distributed::RemoteProduceRpcServer &remote_produce_server() override {
-    return remote_produce_server();
+    return remote_produce_server_;
   }
 
   communication::rpc::System system_{config_.worker_endpoint};