Inconsistencies between XTRAB0, PicName, and where they're scaled

Marathon Run uses PicName over XTRAB0, and will scale PicName/XTRAB0 down over 256x256. Record Attack does not use PicName, but still scales XTRAB0 down over 256x256. Character Select Screen uses PicName over XTRAB0, but will not scale PicName/XTRAB0 down over 256x256.

The wiki states that 256x256 is used for high resolution, so this behavior should probably be consistent.