revert audio session release (#1190)

Author: Brazol

packages/stream_video/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Upcoming
 
 ### 🐞 Fixed
+* Reverted iOS audio session release on call leave ([#1155](https://github.com/GetStream/stream-video-flutter/pull/1155)) due to reports of broken audio playout on some iOS sessions.
 * Improved SFU join, recovery and migration logic to reduce failed joins with reconnect loops when joining full or shutting-down SFU 
 * Fixed race condition in `Call.join` when another connect is already in progress, with proper timeout handling.
 * Fixed `consumeAndAcceptActiveCall` to ensure the coordinator WS is connected before consuming incoming calls during cold start.

packages/stream_video/lib/src/webrtc/rtc_manager.dart

@@ -498,14 +498,6 @@ class RtcManager extends Disposable {
     onLocalTrackPublished = null;
     onRemoteTrackReceived = null;
 
-    if (CurrentPlatform.isIos) {
-      try {
-        await RtcMediaDeviceNotifier.instance.pauseAudioPlayout();
-      } catch (e) {
-        _logger.w(() => '[dispose] pauseAudioPlayout failed: $e');
-      }
-    }
-
     await Future.wait([
       if (publisher != null)
         publisher!.dispose().catchError((Object e, StackTrace stk) {