Update resources/rdiff_backup.rb
Update resources/rdiff_backup.rb

Co-authored-by: Lance Albertson <3161cdc7bf197e4c3a35b9cbe358c79910f27e90@osuosl.org>
osuosl-cookbooks/rdiff-backup,osuosl-cookbooks/rdiff-backup,osuosl-cookbooks/rdiff-backup,osuosl-cookbooks/rdiff-backup