Revert "Replace unsafe react lifecycle methods"

bigbluebutton-html5/imports/startup/client/intl.jsx

.../ui/components/actions-bar/actions-dropdown/component.jsx

...button-html5/imports/ui/components/dropdown/component.jsx

...luebutton-html5/imports/ui/components/media/container.jsx

...5/imports/ui/components/presentation/cursor/component.jsx

...5/imports/ui/components/presentation/cursor/container.jsx

...ton-html5/imports/ui/components/screenshare/component.jsx

...r-participants/user-list-item/user-dropdown/component.jsx

...ui/components/whiteboard/annotations/pencil/component.jsx

...s/ui/components/whiteboard/annotations/poll/component.jsx

...board/whiteboard-overlay/text-draw-listener/component.jsx

...eboard/whiteboard-toolbar/toolbar-menu-item/component.jsx

...ard/whiteboard-toolbar/toolbar-submenu-item/component.jsx