Fix utf8 text split iteration

Author: lukasIO

src/room/participant/LocalParticipant.ts

@@ -1608,7 +1608,7 @@ export default class LocalParticipant extends Participant {
     const writableStream = new WritableStream<string>({
       // Implement the sink
       async write(text) {
-        for (const textChunk in splitUtf8(text, STREAM_CHUNK_SIZE)) {
+        for (const textChunk of splitUtf8(text, STREAM_CHUNK_SIZE)) {
           await localP.engine.waitForBufferStatusLow(DataPacket_Kind.RELIABLE);
           const chunk = new DataStream_Chunk({
             content: new TextEncoder().encode(textChunk),