Consistent terminology

src/freedombone-restore-local

     obnam restore -r $USB_MOUNT/backup/${2} --to ${1}
 }
 
-function restore_configuration {
+function restore_config {
     if [[ $RESTORE_APP != 'all' ]]; then
         if [[ $RESTORE_APP != 'config' ]]; then
             return
 check_backup_exists
 check_admin_user
 copy_gpg_keys
-restore_configuration
+restore_config
 same_admin_user
 restore_mariadb
 restore_letsencrypt