susbsys: settings: optimized fcb compression for deleted entry

During the compression an empty settings entry was
copied to the scratch sector form the oldest sector in case
lack of newer entry version in fcb storage.

This doesn't make sense as empty entry and lack of entry has
similar meaning.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
1 file changed