UX: Don't disable media controls when buffering

[grahamotte]

Original issue: navidrome/navidrome#568

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I run navidrome on a linode and I'm currently somewhere with less than perfect internet. When I click next to skip a song this spinner comes up:

However if I also want to skip the next song, this can be pretty annoying since I need to wait for it to buffer before I'm allowed to click next again.

Perhaps the solution is simply to cleanup my music library but it would be great if I was allowed to quick skip to the next song.

Cheers

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[lijinke666]

done