Update S2InitTwitter.groovy

s2-init-twitter results configs on Config.groovy:

- grails.plugins.springsecurity.twitter.app.consumerKey
- grails.plugins.springsecurity.twitter.app.consumerSecret

and causes "401 Unauthorized" by "Connect with Twitter" button.
the document says:

- grails.plugins.springsecurity.twitter.consumerKey
- grails.plugins.springsecurity.twitter.consumerSecret