Fix the initial config of the old features

We did "Add configurable module" before, but it changed the default dependency:

# Old
require 'triage/triage'

# New
require 'triage/config/application'

It breaks some existing features, such as the schedule-type triage. We need put the triage/config/application into triage/triage.rb so that we can keep the old code working:

require 'triage/triage'