fix auto needsVoices

Author: Raltyro

source/funkin/editors/charter/SongCreationScreen.hx

@@ -451,7 +451,7 @@ class SongCreationScreen extends UISubstateWindow {
 		var vslicechart:NewSwagSong = Json.parse(files.get('${songId}-chart.json'));
 		var playData = vslicemeta.playData;
 
-		var meta:ChartMetaData = formatMeta({name: songId, needsVoices: files.exists('Voices.${Flags.SOUND_EXT}')});
+		var meta:ChartMetaData = formatMeta({name: songId, needsVoices: files.get('Voices.${Flags.SOUND_EXT}') != null});
 		var diffCharts:Array<ChartDataWithInfo> = [], events:Array<ChartEvent> = null;
 		VSliceParser.parse(vslicemeta, vslicechart, meta, diffCharts, songId);