Use getter rather than direct access to key

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/collections/trunk@1477597 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/collections4/map/ListOrderedMap.java

@@ -685,12 +685,12 @@ public class ListOrderedMap<K, V>
 
         @Override
         public V getValue() {
-            return parent.get(key);
+            return parent.get(getKey());
         }
 
         @Override
         public V setValue(final V value) {
-            return parent.decorated().put(key, value);
+            return parent.decorated().put(getKey(), value);
         }
     }