makes disableAudioFocus flag generic, so it can be used also from iOS

react/features/base/flags/constants.js

@@ -11,7 +11,7 @@ export const ADD_PEOPLE_ENABLED = 'add-people.enabled';
  * Used by apps that do not use Jitsi audio.
  * Default: disabled (false)
  */
-export const ANDROID_AUDIO_FOCUS_DISABLED = 'android.audio-focus.disabled';
+export const AUDIO_FOCUS_DISABLED = 'audio-focus.disabled';
 
 /**
  * Flag indicating if the audio mute button should be displayed.

react/features/mobile/audio-mode/middleware.js

@@ -1,5 +1,5 @@
 // @flow
-import { NativeEventEmitter, NativeModules, Platform } from 'react-native';
+import { NativeEventEmitter, NativeModules } from 'react-native';
 
 import { APP_WILL_MOUNT, APP_WILL_UNMOUNT } from '../../base/app';
 import { SET_AUDIO_ONLY } from '../../base/audio-only';
@@ -9,7 +9,7 @@ import {
     CONFERENCE_JOINED,
     getCurrentConference
 } from '../../base/conference';
-import { getFeatureFlag, ANDROID_AUDIO_FOCUS_DISABLED } from '../../base/flags';
+import { getFeatureFlag, AUDIO_FOCUS_DISABLED } from '../../base/flags';
 import { MiddlewareRegistry } from '../../base/redux';
 
 import { _SET_AUDIOMODE_DEVICES, _SET_AUDIOMODE_SUBSCRIPTIONS } from './actionTypes';
@@ -140,8 +140,8 @@ function _updateAudioMode({ getState }, next, action) {
     const { enabled: audioOnly } = state['features/base/audio-only'];
     let mode;
 
-    if (Platform.OS === 'android' && getFeatureFlag(state, ANDROID_AUDIO_FOCUS_DISABLED, false)) {
-        mode = AudioMode.DEFAULT;
+    if (getFeatureFlag(state, AUDIO_FOCUS_DISABLED, false)) {
+        return result;
     } else if (conference) {
         mode = audioOnly ? AudioMode.AUDIO_CALL : AudioMode.VIDEO_CALL;
     } else {