Playlists: improve table update after deleting (purging) track files #13127
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Fixes #13111 which I can actually only reproduce with main (couldn't find the change causing it).
But it doesn't hurt to get rid of the double select and have the now separate PlaylistDAO signals for
a) updating the sidebar and
b) reloading the current tracks in 2.4
Also enables Delete Track Files in playlists #13112
Though, no matter if main or 2.4, this feels like a bandaid anyway. PlaylistDAO looks unnecessarily complex, a better solution would probably be PlaylistStorage / PlaylistSummary (Crate equivalent) like proposed by @ninomp in #4846