ENYO-437: Add MarqueeSample to package.js

### Issue
`MarqueeSample` was missing from the `package.js` file for Moonstone samples. Having this included would aid in testing such aspects as RTL via the Sample.html app.

### Fix
`MarqueeSample` has been added to `package.js`.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>