Fixed normal bug EXT-3544 (Voice icon doesn't become "muted" in the voice...

Fixed normal bug EXT-3544 (Voice icon doesn't become "muted" in the voice controls panel after muting a resident)
--added updating of speakers in speaker manager when LLVoiceClient::participantUpdatedEvent and
LLViewerChatterBoxSessionAgentListUpdates::post events come.

--HG--
branch : product-engine