ncdu: Update to version 1.16

ncdu: Update to version 1.16

- Update from 1.15.1 to 1.16
- Update of rootfile not required
- Changelog
   1.16 - 2021-07-02
	- Increase width of size bar depending on terminal size (Christian Göttsche)
	- Set/increment $NCDU_LEVEL variable when spawning a shell
	- Indicate whether apparent size or disk usage is being displayed
	- Display setuid, setgid and sticky bits in file flags in extended mode
	- Fix error handling while reading --exclude-from file
	- Improve JSON import to allow for several future extensions to the format
	- Export link count in JSON dumps
	- Don't export inode in JSON dumps for non-hardlinks

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>