main/busybox: fix klogd dependency on logger
klogd depends on a syslog implementation for its output, but it does not have to be 'syslog': syslog, rsyslog and syslog-ng all provide a 'logger' virtual target which klogd can depend on.
(regardless of the fact that more sophisticated syslog implementations can read from kernel logs directly and probably do not need klogd...)
Nothing critical, but shouldn't hurt either, unless someone has multiple syslog implementations installed and depends on klogd to start busybox syslog explicitly...