Only list played songs in the statistics song list

Songs never played are left out of the song list, so the Show menu is
hidden while it is shown.

tests/fakes/ui_tour.gd

@@ -267,6 +267,8 @@ func run(on_state: Callable) -> void:
 	statistics_view.apply_filter()
 	await _settle()
 	await on_state.call("statistics_search", statistics_view)
+	# Chrono Trigger has never been played, so the song list searches for another
+	statistics_view.search_field.text = "zelda"
 	statistics_view.set_mode(StatisticsView.Mode.SONGS)
 	await _settle()
 	await on_state.call("statistics_songs_search", statistics_view)