Fix for bug #1181802

While I agree these icons look much better, I think the fact that some of the old ones that were not replaced are still 16x16 and the new ones are 32x32 makes me think that the old ones should also be reworked for 32x32. I will make a comment in LaunchPad, too, about this. Maybe grofaty will do the rest of the icons if you also agree they are needed for Pinta 1.5