Last week, in recounting the Denver Broncos’ desultory season-opening defeat to the Seattle Seahawks, I referred to fans convinced that former Univeristy of Oregon standout Bo Nix will prove to be the team’s new quarterback messiah as Bo-Ners. But after the squad’s equally lackluster 13-6 surrender to the Pittsburgh Steelers on September 15, Denver loyalists found themselves posting about a different kind of boners — the head-slapping mistakes that prevented the Broncos from scoring a single touchdown en route to another ignominious defeat…