i - fix issue where user cannot leave voice conference when clicking on headset icon

.../bigbluebutton/modules/phone/managers/FlashCallManager.as

...bigbluebutton/modules/phone/managers/WebRtcCallManager.as

.../org/bigbluebutton/modules/phone/maps/WebRtcEventMap.mxml

...ebutton/modules/phone/views/components/ToolbarButton.mxml