Update CircularDoublyLinkedList.java

removed unnecessary null assignment

Author: richk21

src/main/java/com/thealgorithms/datastructures/lists/CircularDoublyLinkedList.java

@@ -112,7 +112,6 @@ public E remove(int pos) {
         current.prev.next = current.next;
         current.next.prev = current.prev;
         E removedValue = current.value;
-        current = null;
         size--;
         return removedValue;
     }