skill: Restore the -p flag functionality
When the skill program was ported to the new API the code to filter on PID, used by the -p option, was missed. It is now restored. References: https://bugs.debian.org/1025915
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When the skill program was ported to the new API the code to filter on PID, used by the -p option, was missed. It is now restored. References: https://bugs.debian.org/1025915