Code review comment for lp://staging/~3v1n0/libindicator/reduce-image-serialization

So, I've pushed a new revision that handles the things in a different way: basically setting the pixel size to 0 makes gtk to load the icon at its full size; so we can safely do that if the actual icon size isn't bigger than the ICON_SIZE value.

In this way also gtk apps (such as the greeter) won't need any change to support these kinds of icons.