Run cups-pk-helper service under its own daemon user account. Fixes T7453.
Summary: Run cups-pk-helper service under its own daemon user account. Fixes T7453.
Test Plan: If no printer available, create a dummy one with lpadmin -p myprinter -E -v ipp://myprinter.local/ipp/print (per man lpadmin). WLOG, print something to myprinter. Open the "printers" part of gnome-control-center (Alt+F2 > Printers). Observe the button 1 job and click it. In the myprinter - Active Jobs window, find the submitted job and press the trash can to cancel the job. With this fix, it should successfully cancel. Previous behavior resulted in nothing happening.
Reviewed By: JoshStrobl
Subscribers: davidjharder, Jacalz
Maniphest Tasks: T7453
Differential Revision: https://dev.getsol.us/D6687