They’re in a latte trouble. More than a half-dozen protesters were cuffed Tuesday during a “sit-in” demonstration at a Park Slope Starbucks store that unionized in October and is set to close by the end of this month. A spokesperson from the NYPD confirmed seven protesters were arrested, though information regarding their charges was unavailable as of Tuesday afternoon. A union organizer confirmed those arrested were former Starbucks employees and “allies” of store staff. The rally, organized by labor union Workers United, began about 11:30 a.m. Tuesday with a “sip-in” – composed of dozens of workers, former workers and…..