Change DISABLE_CHOWN to disable-chown
Change DISABLE_CHOWN to disable-chown

The correct field is `disable-chown`, not `DISABLE_CHOWN`. Maybe it was in the past?
progrium/dokku,dokku/dokku,alexquick/dokku,alexquick/dokku,alexquick/dokku,jimjag/dokku,alexquick/dokku,progrium/dokku,claytonbrown/dokku,dokku/dokku,jimjag/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,alexquick/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,jimjag/dokku,jimjag/dokku,jimjag/dokku,alexquick/dokku,jimjag/dokku,progrium/dokku,claytonbrown/dokku,progrium/dokku,claytonbrown/dokku,dokku/dokku,claytonbrown/dokku,dokku/dokku,alexquick/dokku,dokku/dokku,progrium/dokku,jimjag/dokku,progrium/dokku,claytonbrown/dokku,jimjag/dokku,dokku/dokku,alexquick/dokku