Fix incorrect path in theme build script

`buildThemes.ts` had an incorrect path for generating the theme json files.

It probably happened when we did some reorganization of the styles directory.

Co-Authored-By: gibusu <95764254+gibusu@users.noreply.github.com>
409b818717Nate Butler committed on 4/12/2022, 4:37:38 PMparent00fb575
1 file changedLine totals unavailable