Windows: missing ! in update volume location

Windows: missing ! in update volume location

The check to see if the volume name is numeric or not was
missing a ! in order to perform the correct test.  Add it.

Reviewed-on: http://gerrit.openafs.org/5331
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Jeffrey Altman <jaltman@openafs.org>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
(cherry picked from commit 8127e9332be8cadda001f05c6036d4c87e04cb4a)

Change-Id: I9760845b597c1653a78ab3e496166e5df03b7575
Reviewed-on: http://gerrit.openafs.org/6022
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>