- hide mic settings when user has joined the voice conference

...rc/org/bigbluebutton/main/views/ChromeChangeMicImage.mxml

...c/org/bigbluebutton/main/views/FirefoxChangeMicImage.mxml

...bigbluebutton/modules/phone/events/UseFlashModeCommand.as

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

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

...g/bigbluebutton/modules/phone/maps/FlashCallEventMap.mxml

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

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