[RN] Make the audio muted icon consistent with the web

react/features/filmstrip/components/native/AudioMutedIndicator.js

 import React, { Component } from 'react';
-import Icon from 'react-native-vector-icons/FontAwesome';
+
+import { Icon } from '../../../base/font-icons';
 
 import styles from './styles';
 
     render() {
         return (
             <Icon
-                name = 'microphone-slash'
+                name = 'mic-disabled'
                 style = { styles.thumbnailIndicator } />
         );
     }