Windows: Increase default number of daemon threads

Windows: Increase default number of daemon threads

With the SMB interface there was little benefit to having
a large background daemon worker pool since it was so rarely
used.  Now that the redirector does everything in the background
daemon workers, increase the default from 4 to 16 threads.

Change-Id: I319182e4c539c14d06fe62dde2b41a159e4edea6
Reviewed-on: http://gerrit.openafs.org/6058
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Tested-by: Jeffrey Altman <jaltman@secure-endpoints.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>