style: apply cargo fmt to navigation.rs

Author: giovannipapini

src/app/navigation.rs

@@ -100,7 +100,9 @@ impl App {
             .toc
             .iter()
             .filter(|entry| {
-                levels.as_ref().is_some_and(|l| l.display_level(entry.level).is_some())
+                levels
+                    .as_ref()
+                    .is_some_and(|l| l.display_level(entry.level).is_some())
             })
             .nth(display_idx);
         if let Some(entry) = target {