Fix mipmapping artifact in Shin Sangoku Musou Multi Raid

I'm not too sure if this makes sense to force load texture sample parameters only when mipmap is disabled.

This fixes the following artifact in  Shin Sangoku Musou Multi Raid 

![screen00013](https://f.cloud.github.com/assets/3000282/867173/a3ca85c4-f6da-11e2-8b7f-cd8835151273.jpg)