Update chrome and firefox webcam and microhpone permissions helper.

bigbluebutton-client/branding/default/style/css/V2Theme.css

bigbluebutton-client/locale/en_US/bbbResources.properties

...org/bigbluebutton/main/views/BrowserPermissionHelper.mxml

...rg/bigbluebutton/main/views/ChromeMicPermissionImage.mxml

...g/bigbluebutton/main/views/FirefoxMicPermissionImage.mxml

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

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

...gbluebutton/main/views/assets/chrome-allow-mic-access.png

...rg/bigbluebutton/main/views/assets/chrome-permissions.png

...nt/src/org/bigbluebutton/main/views/assets/ff-arrow-1.png

...nt/src/org/bigbluebutton/main/views/assets/ff-arrow-2.png

...uebutton/main/views/assets/firefox-permissions-macosx.png

...ebutton/main/views/assets/firefox-permissions-windows.png