s3-spoolss: fix notify_printer_status_byname.

s3-spoolss: fix notify_printer_status_byname.

This took me almost a week to find, so here a little longer explanation:

When a windows client registers printer *status* change notifies using
spoolss_RemoteFindFirstChangeNotify, it registers them to a print server handle,
not a printer handle. We were then correctly monitoring the printer status
changes but were sending out the spoolss_RouterReplyPrinterEx via the back-channel
connection with job_id set to 0 (which we only may do for monitored printer
change status notifies on printer handlers, not print server handles). Windows
was then showing a new empty dummy printer icon in the explorer as it cannot
route the notify event to the approriate local handle. It also discarded the
content of the notify event message of course. With this, printer change notify for
pausing, resuming and purging printers nicely works again here.

Jerry, Tim and all other printing gurus, please check.

Guenther