Remember location in file list at disk swap

[GoogleCodeExporter]

It would be cool if the emulator would remember where you were in the file list 
when you want to insert a new disk.

Curently playing a game with a lot of disk swapping is a pain if there is a lot 
of files cause it takes ages to scroll through the list every time.

Original issue reported on code.google.com by nebnos...@gmail.com on 6 Jun 2012 at 9:45