ENYO-424: Prevent tap event when user presses to stop scrolling

This issue was addressed in enyo.ScrollStrategy, but the moon
version doesn't call the sup method, so applying the same fix here.

Enyo-DCO-1.1-Signed-Off-By: Gray Norton (gray.norton@lge.com)
Merge pull request #1756 from enyojs/ENYO-424-graynorton

ENYO-424: Prevent tap event when user presses to stop scrolling

Reviewed-By: Aaron Tam (aaron.tam@lge.com)
Integrated-By: Ryan Duffy (ryan.duffy@lge.com)