Classic confinement request: ncdu

Unfortunately not all applications will fit neatly into the snap model, or put another way, the snap sandboxing will not allow all existing applications to function without modification. As such, whilst classic confinement removes the sandbox and can allow traditional applications to function, there are limited use-cases for this. So since ncdu does not fit within one of the supported categories for classic confinement, it is not able to be granted at this time so I am removing this request for classic confinement from our queue. The ncdu snap still works in a majority of use-cases however, assuming volumes are mounted under /media etc so I think this is still a great application as a snap.

@alexmurray Thanks for your consideration.