Draft: MLStorage: fix double sd appearing

On some devices an sdcard will show as /mnt/media_rw/X and as /storage/X. This will show the sd card twice, but the first path when parsed will not show any subitems, and can't be used as a device for the medialibrary. Because of this, and in case of other occurences like this one, the provider will prioritize the path with /storage/ when finding two directories with the same 'lastName'.