Authentication process in 'Reddit Example' fails as the QOAuth2AuthorizationCodeFlow status never changes from TemporaryCredentialsReceived to Granted.

Steps to reproduce:

• set up the Reddit Example so that it is ready to run ( https://doc.qt.io/qt-5.10/qtnetworkauth-redditclient-example.html )
• create reddit account
• register the app here: https://www.reddit.com/prefs/apps/
  • redirect uri: http://localhost:1337/
• copy the client_id from reddit (app page)
• run Qt's Reddit Example with the client_id as an argument
• observe the status changes of 'oauth2' found in file 'redditwrapper.cpp'
  EXPECTED: the status changes eventually to 'QAbstractOAuth::Granted'
  ACTUAL: The status never moves beyond 'QAbstractOAuth::TemporaryCredentialsReceived'