Remove hardcoded pixels in FilePicker

The pixels hardcoded in FPInodeView make the rows look very small in phones such as an Htc One. Inflating a row that uses dp solves this UI bug. 
![filepicker-htc-one-hardcode](https://cloud.githubusercontent.com/assets/507510/4836613/4b468c8e-5fc7-11e4-93e4-9be2fc0f5a9c.png)

![filepicker-htc-one-dp-dimensions](https://cloud.githubusercontent.com/assets/507510/4836614/4e3de32e-5fc7-11e4-84af-d23ffb57c55b.png)