Fix file data pointer

I was getting errors after upgrading... changing to look at config.data fixed for me.

```
TypeError: Cannot read property 'name' of undefined
    at upload (http://127.0.0.1:8000/static/recipes/js/vendor/angular-file-upload.js:38:78)
    at http://127.0.0.1:8000/static/recipes/js/recipes.js:48:24
    at Array.forEach (native)
    at Function.j.each.j.forEach (http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.1/underscore-min.js:5:599)
    at Scope.$scope.onFileSelect (http://127.0.0.1:8000/static/recipes/js/recipes.js:42:16)
    at Parser.functionCall (http://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.1/angular.js:9885:21)
    at http://127.0.0.1:8000/static/recipes/js/vendor/angular-file-upload.js:91:5
    at Scope.$get.Scope.$eval (http://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.1/angular.js:11576:28)
    at Scope.$get.Scope.$apply (http://cdnjs.cloudflare.com/ajax/libs/angular.js/1.2.1/angular.js:11676:23)
    at HTMLInputElement.<anonymous> (http://127.0.0.1:8000/static/recipes/js/vendor/angular-file-upload.js:90:10) 
```