rpc/server: fix getversion reply for staterootinheader extension

Proper network should have it set to `true` and client should know about it.

pkg/rpc/server/server.go

@@ -513,6 +513,7 @@ func (s *Server) getVersion(_ request.Params) (interface{}, *response.Error) {
 		TCPPort:           port,
 		Nonce:             s.coreServer.ID(),
 		UserAgent:         s.coreServer.UserAgent,
+		StateRootInHeader: s.chain.GetConfig().StateRootInHeader,
 	}, nil
 }