test: always use background timers on iOS

Importing the entire feature triggers web UI imports.

react/features/base/media/middleware.js

@@ -13,7 +13,7 @@ import {
     showWarningNotification
 } from '../../notifications';
 import { isForceMuted } from '../../participants-pane/functions';
-import { isScreenMediaShared } from '../../screen-share';
+import { isScreenMediaShared } from '../../screen-share/functions';
 import { SET_AUDIO_ONLY, setAudioOnly } from '../audio-only';
 import { isRoomValid, SET_ROOM } from '../conference';
 import { getLocalParticipant } from '../participants';

react/features/mobile/polyfills/browser.js

@@ -441,12 +441,12 @@ function _visitNode(node, callback) {
     // Required by:
     // - lib-jitsi-meet
     // - Strophe
-    if (Platform.OS === 'android') {
+    //if (Platform.OS === 'android') {
         global.clearTimeout = BackgroundTimer.clearTimeout.bind(BackgroundTimer);
         global.clearInterval = BackgroundTimer.clearInterval.bind(BackgroundTimer);
         global.setInterval = BackgroundTimer.setInterval.bind(BackgroundTimer);
         global.setTimeout = (fn, ms = 0) => BackgroundTimer.setTimeout(fn, ms);
-    }
+    //}
 
     // localStorage
     if (typeof global.localStorage === 'undefined') {