[M103] Fix notification issue when Kiosk app opened

The current logic of showing "ask admin to set up the device"
notification depends on the visibility of the Kiosk app button. However,
Kiosk button is hidden when Kiosk app is opened, and the notification
is shown by mistake.

We should show the notification only when no Kiosk app is setup.

Bug: b/234765162
Change-Id: I6301e74b96455c76546421705ecb160b5c6fa403
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3692640
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Commit-Queue: Yunke Zhou <yunkez@google.com>
Cr-Commit-Position: refs/branch-heads/5060@{#644}
Cr-Branched-From: b83393d-refs/heads/main@{#1002911}

ash/shelf/login_shelf_view.cc

@@ -750,8 +750,10 @@ void LoginShelfView::SetKioskApps(
   kiosk_apps_button_->SetApps(kiosk_apps);
   UpdateUi();
   if (LockScreen::HasInstance()) {
+    // Consider Kiosk apps button to be present when there are Kiosk apps installed.
+    // TODO(b/234765162): rename the method as the naming is confusing.
     LockScreen::Get()->SetKioskAppsButtonPresence(
-        kiosk_apps_button_->GetVisible());
+        kiosk_apps_button_->HasApps());
   }
 }