Simplify two remove-if loops (#77)

These are semantically identical easier to read.

src/main/java/org/apache/commons/collections4/list/CursorableLinkedList.java

@@ -274,12 +274,7 @@ public class CursorableLinkedList<E> extends AbstractLinkedList<E> implements Se
     protected void registerCursor(final Cursor<E> cursor) {
         // We take this opportunity to clean the cursors list
         // of WeakReference objects to garbage-collected cursors.
-        for (final Iterator<WeakReference<Cursor<E>>> it = cursors.iterator(); it.hasNext();) {
-            final WeakReference<Cursor<E>> ref = it.next();
-            if (ref.get() == null) {
-                it.remove();
-            }
-        }
+        cursors.removeIf(ref -> ref.get() == null);
         cursors.add(new WeakReference<>(cursor));
     }
 

src/main/java/org/apache/commons/collections4/set/ListOrderedSet.java

@@ -261,14 +261,10 @@ public class ListOrderedSet<E>
         if (result == false) {
             return false;
         }
-        if (decorated().size() == 0) {
+        if (decorated().isEmpty()) {
             setOrder.clear();
         } else {
-            for (final Iterator<E> it = setOrder.iterator(); it.hasNext();) {
-                if (!decorated().contains(it.next())) {
-                    it.remove();
-                }
-            }
+            setOrder.removeIf(e -> !decorated().contains(e));
         }
         return result;
     }