Update gnome-calculator to 3.20.2

Overview of changes in gnome-calculator 3.20.2

    * lib: prevents segfault when elements of division to zero have
          null assigned tokens (fixes #769364) (Alberto Ruiz)
    * Updated Indonesian translation (Andika Triwidada)
    * Updated Norwegian bokm奪l translation. (Kjartan Maraas)

(prlw1)