livecheck: always print latest throttled version

When the throttle interval elapses for a package and there aren't any
throttled versions (or the package doesn't use a numeric throttle),
livecheck prints "Using latest version because throttle interval
elapsed" in place of the matched throttle versions. This works but
it doesn't print the throttle version (i.e., it doesn't align with the
underlying data) and it's a bit verbose. This modifies the `puts` call
to print the latest throttled version along with a "(throttle interval
elapsed)" annotation, which is more in line with existing livecheck
output.