Don't pass last hash into UpdateServiceNodeList

It's there for polling, which we aren't doing anymore; we just got the
hash from oxend's push notification, so if it pass it in then we will
always get an "unchanged" result because we're telling oxend that we
already have the data for that hash updated.

This just drops the hash completely because we don't need it anymore.

llarp/rpc/lokid_rpc_client.cpp

@@ -102,11 +102,11 @@ namespace llarp
       LogDebug("new block at height ", m_BlockHeight);
       // don't upadate on block notification if an update is pending
       if (not m_UpdatingList)
-        UpdateServiceNodeList(std::string{msg.data[1]});
+        UpdateServiceNodeList();
     }
 
     void
-    LokidRpcClient::UpdateServiceNodeList(std::string topblock)
+    LokidRpcClient::UpdateServiceNodeList()
     {
       nlohmann::json request, fields;
       fields["pubkey_ed25519"] = true;
@@ -114,8 +114,6 @@ namespace llarp
       fields["funded"] = true;
       fields["active"] = true;
       request["fields"] = fields;
-      if (not topblock.empty())
-        request["poll_block_hash"] = topblock;
       m_UpdatingList = true;
       Request(
           "rpc.get_service_nodes",
@@ -169,7 +167,7 @@ namespace llarp
       };
       m_lokiMQ->add_timer(makePingRequest, PingInterval);
       // initial fetch of service node list
-      UpdateServiceNodeList("");
+      UpdateServiceNodeList();
     }
 
     void

llarp/rpc/lokid_rpc_client.hpp

@@ -56,7 +56,7 @@ namespace llarp
       Command(std::string_view cmd);
 
       void
-      UpdateServiceNodeList(std::string topblock);
+      UpdateServiceNodeList();
 
       template <typename HandlerFunc_t, typename Args_t>
       void