Use smaller token size instead of scale for Tiny

[BillyMailman]

Right now, if a token is set to Small/Tiny, this bit of code makes the token scale down, instead of using the width/height. This is probably the right approach for Small, but for Tiny creatures, a width/height of 0.5 and scale of 1 works just fine, resulting in a token that snaps to the four corners of each grid square.