I think most Russians pronounce "voiced х" sound here. In standard Russian letter "г" mostly denotes "voiced к" sound but in South Russian pronunciation as well as in Ukrainian accent (rather common) this letter is pronounced as "voiced х" sound. Moreover, even in standard Russian letter "г" in some words (like interjections "Ага"=Aha, "угу"=uh-huh, "Ого"=wow) in fact is pronounced as "voiced х".
So "voiced х" sound is usually associated with letter г, not х.