Shuffle doesn't work with command center (lock menu interface)

When shuffling is enabled, the "next"/"previous" buttons on the lock screen don't shuffle the songs. I think that changing the remoteControlServiceHitPlayNextIfPossible and remoteControlServiceHitPlayPreviousIfPossible functions to use VLCPlaybackService.next/VLCPlaybackService.previous for changing the song would work.

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