updateConfiguration() does not work for maxAudioBW

[vpoddubchak]

Based on documentation, API allows to change audio bitrate on the fly. But when I try to do it, it return error. Steps to reproduce:

1. Start licode demo on web page: https://chotis2.dit.upm.es/
2. Enter the room
3. Open console and try to change audio bitrate: localStream.updateConfiguration({maxAudioBW: 10});
4. See error

Note: it is ok for maxVideoBW.