With brush assets, these tool-type icons will be removed completely.
In main already though, it makes some sense to remove the usage of
the icons in the brush tool type enum items. These icons are quite
different than the others and don't look good with a small size anyway.
As far as I can tell this doesn't make a difference in the UI anyway,
since the enum menu selector exposed in the "Brushes" panel didn't
show the icons anyway.
Pull Request: https://projects.blender.org/blender/blender/pulls/121364
fd5a790f36