fix(local-recording) don't use tab audio

We have observed that participant audio is distant and garbled, so we
added the tracks individually to the mixer.

In addition, using tab audio prevents us from using preferCurrentTab due
to: https://bugs.chromium.org/p/chromium/issues/detail?id=1317964 so
losing audio effects but having better participant audio quality (in
addition to better UX) is not a bad compromise.

react/features/recording/components/Recording/LocalRecordingManager.web.ts

@@ -228,12 +228,8 @@ const LocalRecordingManager: ILocalRecordingManager = {
                 // @ts-ignore
                 video: { displaySurface: 'browser',
                     frameRate: 30 },
-                audio: {
+                audio: false,
-                    autoGainControl: false,
+                preferCurrentTab: true
-                    channelCount: 2,
-                    echoCancellation: false,
-                    noiseSuppression: false
-                }
             });
             document.title = currentTitle;