Do not hide playlist items when playlist meta is loading #2973
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I noticed this when playing with #2972 but it actually happens in many situations.
When a playlist is in the loading state, that doesn't actually mean that its items should not be accessible. For example, a playlist is loading while you're activating it. It doesn't make sense to then show a loading spinner covering the whole playlist manager. We already show a loading icon on the playlist name and that's indication enough.
With this change, playlist deletion / activation / selection / adding items don't place a loading spinner on the whole playlist panel. Only when the playlist is in the loading state and doesn't have any items loaded yet, do we show the whole-screen spinner.