Set Resque.inline to match when setting ResqueSpec.inline

This is helpful when using the resque-heroku gem, as it disconnects the
database connection unless Resque.inline? per this commit:
https://github.com/simple10/resque-heroku/commit/a8395541ee74fbfcf0c07e8109686ea8c92c570f

The writer for ResqueSpec.inline = is what sets the value for
Resque.inline