Subtractive Geometry Brushes All Show a + In The World Outliner

Subtractive Geometry Brushes All Show a + In The World Outliner.

Works as expected in 4.19 CL# 4033788

Found in 4.20 CL# 4213847 and 4.21 CL# 4221482

This is a regression. 

1. Open the editor
2. Place any geometry brush in the level
3. Set the brush to subtractive
4. Find the brush in the world outliner

Results:
The icon will still show a + as if it was an additive brush

Expected:
It would show a - to signify it was a subtractive