ENYO-437: Add Marquee sample to Sampler manifest.

### Issue
There is no way to view the Marquee sample in Sampler.

### Fix
The Marquee sample has been added to Sampler's manifest.

### Notes
This PR is effectively dependent on https://github.com/enyojs/moonstone/pull/1751, and will only function properly once we tag next as the moonstone submodule would need to be bumped.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>