Fix sRGB profile in png icon

libpng complains about the 22x22 icon with the warning "libpng warning: iCCP: known incorrect sRGB profile"

Running pngcrush with "-n -q" options display the following message: "pngcrush: iCCP: Not recognizing known sRGB profile that has been edited"

My quick solution for this is to run mogrify on the file.