fix inconsistent code indentation
Fix the color ordering.  I thought that pcx was stored as BGR and targa was RGB, but it turns out
that I accidentally screwed up the bitmask that SDL uses when converting images to surfaces in test.c.
(basically I was imagining that images are ordered as RGB => R is 0xff0000, G is 0xff00 and B is 0xff, but now that
I think about it, that would mean that B is before R).

For the record Targa images are BGR and PCX images are RGB.  I have targa's loader calling img_swizzle
so that it outputs images in the proper format.