devel/libvirt: Fix a typo in a rc script to correct PROVIDE

There is a typo in PROVIDE line in virtlogd. This causes an error when
we run libvirtd service, i.e.,

rcorder: requirement virtlogd' in file /usr/local/etc/rc.d/libvirtd' has no providers.

PR: 284630
Approved by: novel (maintainer)