libpfctl: c2e7cbe0edb backport broke label set on rule

From: Franco Fichtner <franco_at_lastsummer.de>
Date: Fri, 10 Nov 2023 10:03:26 UTC
Hi,

Would somebody mind committing the fix to stable/13?

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275006


Thanks,
Franco