Updates default avatar image

react/features/base/participants/components/Avatar.native.js

  * @private
  * @type {string}
  */
-const _DEFAULT_SOURCE = require('../../../../../images/avatar2.png');
+const _DEFAULT_SOURCE = require('../../../../../images/avatar.png');
 
 /**
  * Implements an avatar as a React Native/mobile {@link Component}.

react/features/base/participants/functions.js

     // If disableThirdPartyRequests disables third-party avatar services, we are
     // restricted to a stock image of ours.
     if (typeof config === 'object' && config.disableThirdPartyRequests) {
-        return 'images/avatar2.png';
+        return 'images/avatar.png';
     }
 
     const { avatarID, avatarURL, email, id } = participant;

react/features/toolbox/defaultToolbarButtons.js

         enabled: true,
         html: <img
             id = 'avatar'
-            src = 'images/avatar2.png' />,
+            src = 'images/avatar.png' />,
         id: 'toolbar_button_profile',
         onClick() {
             JitsiMeetJS.analytics.sendEvent('toolbar.profile.toggled');