fix: Made sure the byte is not converted into an unsigned byte before creating the PlcSINT in the new "getList" method.

Author: chrisdutz

plc4j/spi/src/main/java/org/apache/plc4x/java/spi/values/PlcRawByteArray.java

@@ -72,7 +72,7 @@ public boolean isList() {
     public List<PlcValue> getList() {
         List<PlcValue> shortList = new ArrayList<>(value.length);
         for (byte b : value) {
-            shortList.add(new PlcSINT((short) (b & 0xFF)));
+            shortList.add(new PlcSINT((short) b));
         }
         return shortList;
     }