MFH: r350243

print/cups-filters: update to version 1.0.50.

This should fix a reported regression (I managed to reproduce
it with HP laser printers) when a job is printed but remains
in a job query.

Reported by: Dr. Peter Voigt <pvoigt@uos.de>
Tested by: Dr. Peter Voigt <pvoigt@uos.de>
Discussed at: freebsd-ports@
Approved by: portmgr (erwin)