The humble cop who took down an illegal immigrant who shot two other officers last night in a Queens subway station said today, "I'm not a hero." Lt. Gary Abrahall put four bullets into Raul Nuñez, who jumped a turnstyle and then coldly shot two cops -- Shane Farina, who was critically wounded, and Jason Maass, who was grazed with a bullet -- with one of their own guns. "The cops that took the bullets, they're the heroes," Abrahall said today outside his house. Farina took a bullet in the abdomen and it exited through his sternum. "[Farina] is doing...