fix: Fixes showing phone icon for jigasi participants.

react/features/base/participants/functions.js

 } from './constants';
 import { preloadImage } from './preloadImage';
 
-declare var config: Object;
 declare var interfaceConfig: Object;
 
 /**
  * @returns {boolean}
  */
 export function isIconUrl(icon: ?string | ?Object) {
-    return Boolean(icon) && typeof icon === 'object';
+    return Boolean(icon) && (typeof icon === 'object' || typeof icon === 'function');
 }
 
 /**