Apple TV: Save playback location

At least in remote playback mode, video location is not saved when you exit a video. If you exit the player in the middle of the video and then reopen it, the video begins playback at the beginning.

I'm not sure if this impacts other playback methods (e.g., streaming over SMB), but I assume it does because the savePlaybackState method in Sources/VLCPlaybackService.h is guarded by #if TARGET_OS_IOS.

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