Fixes script path on loadlwf-sample

Fixes script path on `loadlwf-sample.html`. That's no problem about remove lwf-util by https://github.com/gree/lwf-loader/commit/86bcb7eba6edd91c4c34aeebb15b0d17af011067

current: http://gree.github.io/lwf-demo/html5/lwf-loader/loadlwf-sample.html
my fixes: http://watilde.github.io/lwf-demo/html5/lwf-loader/loadlwf-sample.html