[dashboard] fix Chrome no longer hidden for reports (elastic#206988)

Fixes elastic#205794

elastic#196275 removed `setIsVisible`
because https://github.com/elastic/kibana/pull/196275/files#r1811034594.
I could not reproduce the top nav disappearing and reappearing issue.

---------

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

src/platform/plugins/shared/dashboard/public/dashboard_top_nav/internal_dashboard_top_nav.tsx

@@ -118,6 +118,13 @@ export function InternalDashboardTopNav({
     dashboardTitleRef.current?.focus();
   }, [title, viewMode]);
 
+  /*
+   * Manage chrome visibility when dashboard is in print mode.
+   */
+  useEffect(() => {
+    if (!embedSettings && viewMode === 'print') coreServices.chrome.setIsVisible(false);
+  }, [embedSettings, viewMode]);
+
   /**
    * populate recently accessed, and set is chrome visible.
    */