Fixed image padding in product list view

From
![2014-10-18 09_10_27-mozilla firefox](https://cloud.githubusercontent.com/assets/8582633/4688780/b0b36824-5691-11e4-9f56-5ed84ba8e8ff.png)
To
![2014-10-18 09_41_34-mozilla firefox](https://cloud.githubusercontent.com/assets/8582633/4688782/e638421c-5691-11e4-927e-14e286e24d8c.png)