Revert "vos-sync-flag-voltype-properly-20080521"

The convention appears to be that ITSRWVOL is the correct flag for
the backup volume.

This reverts commit dcafea769a1cb70c7b1f8763ae4f7b7744b2a436.

Change-Id: I0f88107d56817515f41a68062053b263683afc94
Reviewed-on: http://gerrit.openafs.org/11341
Reviewed-by: Daria Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>