Mark track state as not null and add default value

The regular tracks are marked as 'confirmed'

app/controllers/tracks_controller.rb

@@ -18,7 +18,6 @@ class TracksController < ApplicationController
   def create
     @track = @program.tracks.new(track_params)
     @track.submitter = current_user
-    @track.state = 'new'
     @track.cfp_active = false
     if @track.save
       redirect_to conference_program_tracks_path(conference_id: @conference.short_title),