Add support for hide from continue listening on new home page shelves route

server/Server.js

@@ -88,6 +88,10 @@ class Server {
     LibraryScanner.setCancelLibraryScan(libraryId)
   }
 
+  getLibrariesScanning() {
+    return LibraryScanner.librariesScanning
+  }
+
   /**
    * Initialize database, backups, logs, rss feeds, cron jobs & watcher
    * Cleanup stale/invalid data