removed optional scope from jaxen dependecy in preauth sample as it breaks war file

samples/preauth/pom.xml

@@ -42,7 +42,6 @@
             <groupId>jaxen</groupId>
             <artifactId>jaxen</artifactId>
             <version>1.1.1</version>
-            <optional>true</optional>
         </dependency>
     </dependencies>