fixed bug in BEValue.getList()

TorrentCreator uses LinkedList for some fields
BEValue.getList() only supported ArrayList and threw an exception when a different type of list was used

Author: Finomosec

bencoding/src/main/java/com/turn/ttorrent/bcodec/BEValue.java

@@ -160,8 +160,8 @@ public long getLong() throws InvalidBEncodingException {
    */
   @SuppressWarnings("unchecked")
   public List<BEValue> getList() throws InvalidBEncodingException {
-    if (this.value instanceof ArrayList) {
-      return (ArrayList<BEValue>) this.value;
+    if (this.value != null && List.class.isAssignableFrom(this.value.getClass())) {
+      return (List<BEValue>) this.value;
     } else {
       throw new InvalidBEncodingException("Excepted List<BEvalue> !");
     }