Rename properties

Rename `webwolf.url.*` to `webwolf.*.url` making it easier to move to a configuration class as no nested property is necessary

webgoat-lessons/xxe/src/main/java/org/owasp/webgoat/xxe/SimpleXXE.java

@@ -57,7 +57,7 @@ public class SimpleXXE extends AssignmentEndpoint {
     @Value("${webgoat.server.directory}")
     private String webGoatHomeDirectory;
 
-    @Value("${webwolf.url.landingpage}")
+    @Value("${webwolf.landingpage.url}")
     private String webWolfURL;