Use blue style for all main actions buttons in popups.

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

...-client/src/org/bigbluebutton/main/views/BBBSettings.mxml

...nt/src/org/bigbluebutton/main/views/FlashMicSettings.mxml

...client/src/org/bigbluebutton/main/views/LockSettings.mxml

...ent/src/org/bigbluebutton/main/views/LoggedOutWindow.mxml

...src/org/bigbluebutton/main/views/OldLocaleWarnWindow.mxml

...ient/src/org/bigbluebutton/main/views/WebRTCEchoTest.mxml

...bigbluebutton/modules/polling/views/PollChoicesModal.mxml

...g/bigbluebutton/modules/polling/views/PollResultsModal.as

...screenshare/view/components/ScreensharePublishWindow.mxml

...gbluebutton/modules/users/views/BreakoutRoomSettings.mxml