[config] fix help output
[config] fix help output

* `dokku:help --all` was getting mangled
* `dokku config:help` wasn't working

jimjag/dokku,dokku/dokku,progrium/dokku,jimjag/dokku,claytonbrown/dokku,elia/dokku,alexquick/dokku,alexquick/dokku,claytonbrown/dokku,alexquick/dokku,claytonbrown/dokku,jimjag/dokku,alexquick/dokku,claytonbrown/dokku,alexquick/dokku,elia/dokku,elia/dokku,dokku/dokku,progrium/dokku,elia/dokku,progrium/dokku,progrium/dokku,elia/dokku,jimjag/dokku,jimjag/dokku,alexquick/dokku,claytonbrown/dokku,dokku/dokku,alexquick/dokku,dokku/dokku,dokku/dokku,dokku/dokku,dokku/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,alexquick/dokku,progrium/dokku,elia/dokku,jimjag/dokku,elia/dokku,claytonbrown/dokku,jimjag/dokku,elia/dokku,jimjag/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku