fix: Prevent the first navbar element from being set as active unnece…

…ssarily in the modern template (#10204)

* fix: Prevent the first navbar element from being set as active unnecessarily in the modern template

* style: apply lint rules

templates/modern/src/nav.ts

@@ -142,7 +142,9 @@ function findActiveItem(items: (NavItem | NavItemContainer)[]): NavItem {
       continue
     }
     const prefix = commonUrlPrefix(url, item.href)
-    if (prefix > maxPrefix) {
+    if (prefix === maxPrefix) {
+      activeItem = undefined
+    } else if (prefix > maxPrefix) {
       maxPrefix = prefix
       activeItem = item
     }