Fix case in event name in browser demo
Fix case in event name in browser demo

Change selection event type to lowercase to comply with the lowercase
translation of event names for common events.

Change-Id: Id20f4ac091552e35674e6ec498b1d1f6551e6bfc

eclipsesource/tabris-js,softnep0531/tabrisjs,pimaxdev/tabris,eclipsesource/tabris-js,paulvi/tabris-js,softnep0531/tabrisjs,mkostikov/tabris-js,moham3d/tabris-js,pimaxdev/tabris,eclipsesource/tabris-js,mkostikov/tabris-js,moham3d/tabris-js