allow CheckboxItem to properly synchronize with DataList selection support

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
fix typo

Enyo-DCO-1.1-Signed-Off-By: Cole Davis (cole.davis@lge.com)
Merge pull request #1568 from enyojs/ENYO-192-coledavis

Fix for: ENYO-192