BHV-14477: Add "enyo-unselectable" class to sample.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>
Merge pull request #1620 from enyojs/BHV-14477-aarontam

BHV-14477: Add "enyo-unselectable" class to sample.