fix: fix PageTitle lookup

Author: paodb

src/main/java/com/flowingcode/vaadin/addons/demo/TabbedDemo.java

@@ -124,7 +124,7 @@ public void addDemo(Class<? extends Component> clazz, String label) {
    */
   public void addDemo(Class<? extends Component> clazz) {
     String label =
-        Optional.ofNullable(clazz.getClass().getAnnotation(PageTitle.class))
+        Optional.ofNullable(clazz.getAnnotation(PageTitle.class))
             .map(PageTitle::value)
             .orElse(clazz.getSimpleName());