fix: sort bookmarks start indices

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1150624 13f79535-47bb-0310-9956-ffa450edef68

src/scratchpad/src/org/apache/poi/hwpf/usermodel/BookmarksImpl.java

@@ -144,6 +144,7 @@ public class BookmarksImpl implements Bookmarks
             Collections.sort( updated, PropertyNode.EndComparator.instance );
             entry.setValue( updated );
         }
+        Arrays.sort( indices );
 
         this.sortedDescriptors = result;
         this.sortedStartPositions = indices;