add reset method to spotlight HoldSample
add reset method to spotlight HoldSample

The reset method was missed when the sample was cloned into spotlight
from enyo causing exceptions when trying to reset the display.

Issue: ENYO-3206
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)

enyojs/enyo-strawman