Windows: AFSDeleteDirEntry deleted flag shuffle

Move the assignment of the deleted flag earlier in AFSDeleteDirEntry()
to avoid potential invalid memory access.

Change-Id: I6d0e1272cc9f2bb491ad291a65b94c53ced9a354
Reviewed-on: http://gerrit.openafs.org/9672
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>