By Kiva Reardon There’s a certain simple charm to Ritesh Batra’s debut The Lunchbox. The film follows lonely housewife Ila (Nimrat Kaur) and curmudgeonly widower Saajan (Irrfan Khan), who are brought together when the lunches she lovingly cooks for her adulterous husband are misdelivered to Saajan. After discovering the error, the two begin passing notes…