GF-59152: Check target of mousedown event instead of last pointed control…

…when deciding whether to unfreeze Spotlight.

Also, don't unfreeze if the default on the down event has been prevented.

Enyo-DCO-1.1-Signed-Off-By: Gray Norton (gray.norton@lge.com)
Unspot when unfreezing during mouseDown.
Merge pull request #99 from enyojs/GF-59152-graynorton

GF-59152: Check target of mousedown event instead of last pointed...