brushsettings: allow presets to restore active color
brushsettings: allow presets to restore active color

https://gna.org/bugs/?18597

b3sigma/libmypaint,achadwick/libmypaint,achadwick/libmypaint,b3sigma/libmypaint,b3sigma/libmypaint,achadwick/libmypaint,achadwick/libmypaint