remove aria-live from InputDecorator when not spotted
remove aria-live from InputDecorator when not spotted

This prevents the browser from reading the contents instead of the
aria-label when spotting a different control.

Issue: ENYO-2431
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)

enyojs/moonstone