Fix local record type in JS example (#532)

Author: beaufortfrancois

index.html

@@ -1262,7 +1262,7 @@ <h4>
           if (record.recordType == "text") {
             const decoder = new TextDecoder(record.encoding);
             text = decoder.decode(record.data);
-          } else if (record.recordType == "act") {
+          } else if (record.recordType == ":act") {
             action = record.data.getUint8(0);
           }
         }