[Misc] Mitigate possible flicker

xwiki-platform-core/xwiki-platform-notifications/xwiki-platform-notifications-test/xwiki-platform-notifications-test-docker/src/test/it/org/xwiki/platform/notifications/test/ui/NotificationsIT.java

@@ -126,6 +126,7 @@ public void setup(TestUtils setup) throws Exception
     @AfterEach
     public void tearDown(TestUtils setup)
     {
+        setup.loginAsSuperAdmin();
         setup.deletePage("XWiki", FIRST_USER_NAME);
         setup.deletePage("XWiki", SECOND_USER_NAME);
         setup.forceGuestUser();