fix(Express): properly format basic auth creds
fix(Express): properly format basic auth creds

previously, some object shorthand was being done, which caused the credential object to be
improperly nested under a "token" key. this caused the frontend code to pass an object instead of
the actual api key, which broke all websocket connections.

leonrch/speech-to-text-nodejs,watson-developer-cloud/speech-to-text-nodejs,watson-developer-cloud/speech-to-text-nodejs