Crack Pie — the trademarked name for the chain’s buttery, sugary pie — will now become Milk Bar Pie. The name was a reference to crack cocaine — the gag being that the pie was just as addictive as the drug. Have you had Crack Pie from Milk Bar? It’s irresistible. Just like these Chocolate Fudge Peanut Butter Crack Brownies!And, ha ha ha…