scan_previous_track and scan_next_track break on compile

[roubaobaozi]

Hi!

The previous track scan_previous_track and next track scan_next_track codes are considered invalid in Goku

Not massively urgent/important request, just noticed there's no open issue for it.

Cheers

[summereasy]

I think you can use :rewind and :fastforward instead. They works just as scan_previous_track and scan_next_track