fix: default_snow_side.png

![screenshot_507429069](https://cloud.githubusercontent.com/assets/1835559/5327076/ac6825ee-7d4b-11e4-9db3-6ca7e70a58d8.png)
![screenshot_514036668](https://cloud.githubusercontent.com/assets/1835559/5327077/ae82591c-7d4b-11e4-84a5-e91e382691dd.png)