ifplugd: Fix typo in default USE flag values (sysvinit, not sysinit)
ifplugd: Fix typo in default USE flag values (sysvinit, not sysinit)

oe-lite/base,sknsean/base,kimrhh/base,hundeboll/base,sknsean/base,kimrhh/base,esben/base,kimrhh/base,hundeboll/base,oe-lite/base,moths/base,diorcety/oe-lite-base,hundeboll/base,esben/base,moths/base,hundeboll/base,oe-lite/base,sknsean/base,oe-lite/base,oe-lite/base,kimrhh/base,oe-lite/base,moths/base,esben/base,esben/base,sknsean/base,sknsean/base,sknsean/base,moths/base,hundeboll/base,moths/base,kimrhh/base,diorcety/oe-lite-base,kimrhh/base,esben/base,esben/base,hundeboll/base,moths/base