“The Last Letter from Your Lover” (2021) – Director Augustine Frizzell’s film – based on Jojo Moyes’ 2008 novel with the same name – is an old-fashioned romance. Well, half of it is. “The Last Letter from Your Lover” is rooted in present-day London, but it flashes back 56 years to 1965 to the same city, when men sported suits and ties to step out of their houses to run random 10-minute errands, and women strived to look like Jackie Kennedy or Marlo Thomas. Perhaps not Ms. Thomas, because “That…