I think this is just banning the sale of cold beer in retail stores, not restaurants. One of the articles posted had an update
"UPDATE Feb. 16: According to Rep. Ron Grant, the bill will not prohibit the sale of cold beer. “I am not going to infringe on the constitutional rights and civil liberties of honest law-abiding citizens and be unfair to certain businesses and both others,” Grant told our sister station WKRN."
Granted, it's still a stupid bill and probably won't have much impact at all. If someone is addicted enough to need to drive around drunk while drinking cold beer, they will still do it. Buy a case of warm beer, go home, put in the fridge (or freezer), then put cold beer in car and drive around.