added missing global

lib/lazy/web-lazy-loader-before.js

@@ -18,7 +18,7 @@
  *   along with SingleFile.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/* global window, screen, scrollBy, requestAnimationFrame, Element, document, dispatchEvent, UIEvent */
+/* global window, screen, scrollBy, requestAnimationFrame, Element, document, dispatchEvent, UIEvent, setTimeout */
 
 (() => {