[Feature/BugFix] Dirplay never gets the file I selected
If you have say 1000 playlist entries and select the 1001 song in the directory
dirplay loads tracks 1-1000 shuffles them and track 1001 is never heard from again
Instead start at the file and loop through the directory mod dir len
Change-Id: Ieded5decdc1f7c44b1be8491dbd4f359ae21f79a
Hint: this is a good way to not wait on dirplay to load a ton of tracks