[BUG] `shredconf.Path()` Does not remove folders

Pretty straightforward. Shred overwrites and removes the files but does not remove the empty folders themselves. 

This bug's source is from ToRat here: https://github.com/lu4p/ToRat/pull/208/files/dff60da2a0523df922c122b91a845e34fa87c8b2#r581535288