fix(stats): Fix audio/video bitrate wrongly report as 0 due to ssrc b…

[ruozhen-vsee]

…itrate stats reset before being used.

Its due to
ssrcStats.resetBitrate()
being called before audio/video bitrate calculation

        if (track.isAudioTrack()) {
            audioBitrateDownload += ssrcStats.bitrate.download;
            audioBitrateUpload += ssrcStats.bitrate.upload;
            audioCodec = ssrcStats.codec;
        } else {
            videoBitrateDownload += ssrcStats.bitrate.download;
            videoBitrateUpload += ssrcStats.bitrate.upload;
            videoCodec = ssrcStats.codec;
        }

[jitsi-jenkins]

Hi, thanks for your contribution!
If you haven't already done so, could you please make sure you sign our CLA (https://jitsi.org/icla for individuals and https://jitsi.org/ccla for corporations)? We would unfortunately be unable to merge your patch unless we have that piece :(.

[jallamsetty1]

Jenkins test this please.

[jallamsetty1]

Good catch! Thanks for fixing it @ruozhen-vsee