The 2019 Nissan Maxima that arrived Wednesday at the 2018 LA Auto Show has a subtly new look with standard LED headlights. A new range-topping Platinum Reserve option package dresses the automaker’s full-size sedan up with pleated semi-aniline leather upholstery cribbed from the company’s GT-R sports car. MORE: 2019 Nissan Altima bows with…