fix: do not remove suffix from "Basic Demo"

Author: javier-godoy

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

@@ -44,7 +44,9 @@ public class EnhancedRouteTabs extends Composite<EnhancedTabs> implements Before
   private final Map<RouterLink, Tab> routerLinkTabMap = new LinkedHashMap<>();
 
   public void add(String text, Class<? extends Component> target) {
-    text = text.replaceFirst("\\s++[Dd]emo$", "");
+    if (!text.equals("Basic Demo")) {
+      text = text.replaceFirst("\\s++[Dd]emo$", "");
+    }
     RouterLink routerLink = getContent().addRouterLink(text, target);
     routerLink.setHighlightCondition(HighlightConditions.sameLocation());
     routerLink.setHighlightAction(