Earlier in the brush assets project, for mesh sculpting, grease pencil,
and curves sculpting, the toolbar brush icon used was changed to a
version with a green highlight. This commit reverts that change to use
the monochrome grey icon instead in each of these modes.
For Sculpt mode specifically, the Paint tool icon is kept as this green
version to differentiate the usages. In future releases, further changes
are planned for sculpting related brushes to better represent their
functionality.
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### Sculpt Mode Toolbar
Pull Request: https://projects.blender.org/blender/blender/pulls/129934
5c880a5291
