Midway through “ The Devil Wears Prada 2 ,” as Runway magazine faces the latest of many challenges to its future integrity and potentially even existence as a publication, now-jaded journo Andy Sachs bemoans the corporate repackaging of so much media into a smaller, cheaper, more efficient and less valuable facsimile of itself. She’s too polite to say “enshittification” — the buzzword that the internet has lately applied to this trend, with particular regard to online platforms — but it hangs almost audibly in the air. That’s a gutsy idea to invoke in a sequel aiming to recapture the glories of a much-loved media property from 20 years ago. The good news is that “The Devil Wears Prada 2” is not willfully enshittified.…