Grace ( Barbie Ferreira ), the heroine of “ Mile End Kicks ,” is a 22-year-old music critic in Toronto who writes for an indie rock magazine called Merge Weekly, where the staff members are bro dweebs who stand around their cubicles engaging in fiery debates about whether Hüsker Dü’s masterpiece is “Zen Arcade” or “Flip Your Wig.” The year is 2011, and Grace has posted 400 articles for Merge in the last year. As working gigs for 22-year-old music critics go, that isn’t bad. Rapper Offset