add nested radios to contextual popup sample
remove uneeded handler
Merge pull request #1838 from enyojs/ENYO-547-derekanderson

ENYO-547: ContextualPopup: Add RadioItem inside ContextualPopup

Reviewed-By: Ryan Duffy (ryan.duffy@lge.com)
Integrated-By: Aaron Tam (aaron.tam@lge.com)