Use range-based loop or replace with STL functions

Change-Id: Ib3fab47318d1bfbb4df8f886a8cd9596525a420f
Reviewed-on: https://gerrit.libreoffice.org/67914Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Tested-by: Noel Grandin <noel.grandin@collabora.co.uk>