BUG Fixed incorrect CSS class on MoneyField holder

Before:

![image](https://f.cloud.github.com/assets/936064/1348327/6871b8fc-36c3-11e3-8e09-b034a6a617b1.png)


After:

![image](https://f.cloud.github.com/assets/936064/1348326/57df330c-36c3-11e3-9546-834cbcf9c419.png)