Comply lock setting 'Hide other viewer's webcams'

...button-html5/imports/api/meetings/server/eventHandlers.js

...ports/api/meetings/server/handlers/webcamOnlyModerator.js

...orts/api/meetings/server/modifiers/webcamOnlyModerator.js

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

...imports/ui/components/video-dock/video-menu/container.jsx