Remove SayHelloAfterDelay from node-client.ts
Remove SayHelloAfterDelay from node-client.ts

was removed from `server.js` and `client.js` in last commit as well.
grpc/grpc-web,grpc/grpc-web,grpc/grpc-web,grpc/grpc-web,grpc/grpc-web,grpc/grpc-web,grpc/grpc-web