Directed by Ramin Niami. With Nazanin Boniadi, Riley Smith, Amy Madigan, Marshall Manesh. Love has no borders and therein lies the premise of the charming, new Iranian-American romantic comedy "Shirin in Love." Nazanin Boniadi plays Shirin, an absent-minded, young Iranian-American living in "Tehrangeles" (the large Iranian community in Los Angeles) with her overbearing mother and empathetic father. Despite being engaged for years to a successful Iranian plastic surgeon in Beverly…