Always set NODE_NETWORK_LIMITED bit

The current pruning implementation does ensure to always conform to BIP159

src/init.cpp

@@ -816,7 +816,7 @@ namespace { // Variables internal to initialization process only
 int nMaxConnections;
 int nUserMaxConnections;
 int nFD;
-ServiceFlags nLocalServices = NODE_NETWORK;
+ServiceFlags nLocalServices = ServiceFlags(NODE_NETWORK | NODE_NETWORK_LIMITED);
 
 } // namespace