[Android] Distinguish pinned folders

[rubbersoul]

i love the pin feature, and it is nice to see the green symbol next to files that are pinned. i'm sure many users, like myself, tend to listen to and therefore pin tracks on an album-by-album or artist-by-artist basis. it would be nice to see the same green symbol next to the folder titles when every file within that folder has been pinned. if only some files within that folder were pinned, a different color symbol could be displayed.

for example, if an artist has three albums and i have pinned all of the tracks from two of those albums, the artist folder would have a blue colored symbol and the two pinned album folders would have a green colored symbol.