outputServices=grpc-js always generates client stub

[alexeyten]

I've tried to use options --ts_proto_opt=esModuleInterop=true,outputServices=grpc-js,outputClientImpl=false, but interface TestClient extends Client { ... } and const TestClient = makeGenericClientConstructor(...) are always generated.

I guess it's because there is no options check in https://github.com/stephenh/ts-proto/blob/main/src/generate-grpc-js.ts#L41-L42

So far, I've found that outputClientImpl option has effect only for outputServices=default.

[stephenh]

Closing as fixed in #472 ; thanks!