Michael Masterangelo isn’t just any grocery store checkout clerk — he’s the one customers hope is on shift. At the Publix in Acworth, Ga., it’s easy to tell when he’s working: The line at his register stretches down the aisle, with shoppers happily waiting 40 minutes or more just to share a few moments with him. And the feeling is mutual. “I love my job,” Masterangelo, 29, told The Post. “Every day, I’m just so happy to be here. I have hundreds of people who know me. It’s wonderful for me. I