Ensure the +/- buttons for Radius change the Radius, not the BrushWidth.
Ensure the +/- buttons for Radius change the Radius, not the BrushWidth.

[Fixes bug #582104]

Fenex/Pinta,Mailaender/Pinta,PintaProject/Pinta,Fenex/Pinta,PintaProject/Pinta,jakeclawson/Pinta,Mailaender/Pinta,PintaProject/Pinta,jakeclawson/Pinta