Bugfix/crash loading voice (#248)

* add voice data url getter and setter

* Ok Voices.js removing types

* Match the function style.

* Actually use the url for the voice file.

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Co-authored-by: CrossPr0duct <alicextensor@gmail.com>

kokoro.js/src/voices.js

@@ -461,7 +461,7 @@ async function getVoiceFile(id) {
     return buffer;
   }
 
-  const url = `${VOICE_DATA_URL}/${id}.bin`;
+  const url = `${voiceDataUrl}/${id}.bin`;
 
   let cache;
   try {