Windows: AFSDeleteObjectInfo AFS_OBJECT_HELD_IN_SERVICE

Move the check for AFS_OBJECT_HELD_IN_SERVICE until after the TreeLock
is held.

Change-Id: I38d095c83dc5878770a7a31bee08048a777cb3cb
Reviewed-on: http://gerrit.openafs.org/9674
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>