Update pom.xml

When simple-web-cluster was re-added it was added in the wrong order.
It relies on webapps, so webapps needs to be built first.
diff --git a/examples/pom.xml b/examples/pom.xml
index 697a3f2..a5d309e 100644
--- a/examples/pom.xml
+++ b/examples/pom.xml
@@ -37,7 +37,7 @@
     </parent>
 
     <modules>
-        <module>simple-web-cluster</module>
         <module>webapps</module>
+        <module>simple-web-cluster</module>
     </modules>
 </project>