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libkcups/PrinterModel: Remove unneeded (deprecated) signal connections

Mike Noe requested to merge work/noee/remove-old-signals into master

Older versions of CUPS apparently had inconsistent behavior with printer change notifications (add/remove). These signals were used to compensate for that behavior. With more recent CUPS versions, notifications appear to be fixed so remove these deprecated duplicate signal handlers.

Testing

In the KCM and plasmoid, adding/removing printing devices should work as before, new devices should show in the list and removed devices should disappear from the list.

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