Fix sliding sync cypress spec (#9569)

cypress/e2e/sliding-sync/sliding-sync.ts

@@ -217,7 +217,7 @@ describe("Sliding Sync", () => {
 
         // disable notifs in this room (TODO: CS API call?)
         cy.contains(".mx_RoomTile", "Test Room").find(".mx_RoomTile_notificationsButton").click({ force: true });
-        cy.contains("None").click();
+        cy.contains("Off").click();
 
         // create a new room so we know when the message has been received as it'll re-shuffle the room list
         cy.createRoom({