[GRASS-git] [OSGeo/grass] e88735: Show ModelRelation in white on dark mode (#2997)

[Martin Landa]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: e887353f6caf3c1b66a7c4ab8358fc45c7e6d74c
      https://github.com/OSGeo/grass/commit/e887353f6caf3c1b66a7c4ab8358fc45c7e6d74c
  Author: Martin Landa <landa.martin at gmail.com>
  Date:   2023-06-04 (Sun, 04 Jun 2023)

  Changed paths:
    M gui/wxpython/gmodeler/model.py

  Log Message:
  -----------
  Show ModelRelation in white on dark mode (#2997)

* use black brush when exporting model to image