dont show wallPegman to start for Scrat

Too much Scrat
![image](https://cloud.githubusercontent.com/assets/1767466/5052396/f2557c5e-6bf4-11e4-9acf-9d605a360166.png)

Scrat is the only skin where if (skin.hittingWallAnimation && skin.hittingWallAnimationFrameNumber) evaluates to true, so we don't need to worry about this regressing other skins.