Facia-tool: Fix delete fronts image

Allows the front image to be deleted. Unchecks the display image box if it's marked.
![screen shot 2014-10-01 at 18 53 25](https://cloud.githubusercontent.com/assets/1492162/4557900/9b380f1a-4ed8-11e4-8278-aa703be4d1cc.png)