Corrected cursor messages, added whiteboardId

...-html5/imports/api/cursor/server/handlers/cursorUpdate.js

...html5/imports/api/cursor/server/modifiers/updateCursor.js

...on-html5/imports/ui/components/presentation/component.jsx

...resentation/cursor/cursor-wrapper-container/container.jsx

...s/presentation/cursor/cursor-wrapper-container/service.js