Wednesday night’s “Broad City” finally gave us something that’s been unclear (but alluded to heavily) since the show’s earliest episodes: A clear definition of Ilana Wexler’s sexuality (sort of). I toss in the “finally” because we live in a world that values labels — where “gay” and “straight” make sense but “bisexual” or (gasp) “pansexual” gets people a little confused. So far, though, the show has avoided giving us a neat little box for Ilana — until this week, when she hooked up with doppelgänger Adele (Alia Shawkat) and talked through the intricacies of her sexuality