Don't use reference for ObjectGuid in WorldSession::CanInteractWithQuestGiver

(based on commit 2e44e58)
(based on commit 3bd308e)

Signed-off-by: stfx <stfx@hotmail.de>

(based on commit a71a614)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>