Use for-range loop with "auto" to modernize a bit

Change-Id: I9efd7ad2d60eac6a6ce0f79af6ccb02ec235c35d
Reviewed-on: https://gerrit.libreoffice.org/45711Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>