remove useless check for sessionID - it's always defined here
remove useless check for sessionID - it's always defined here

paralin/node-steam,fikusas/node-steam,seishun/node-steam,GoeGaming/node-steam,Latule/node-steam,keiosweb/node-steam,Setibi/node-steam,DoctorMcKay/node-steam,Drooids/node-steam