Fixes CMB-1875

## Issue
The cause of the bug is a target change between the keydown and keyup events when hitting Enter on an Input. The keydown targets the input but then it's blurred so the keyup targets body. As a result, the keyup triggers Spotlight to send a onSpotlightFocus event to the InputDecorator which, in turn, refocus the input which freezes Spotlight.

## Fix
Ignores keyup event if keydown event for same key was ignored

Enyo-DCO-1.1-Signed-off-by: Ryan Duffy <ryan.duffy@lge.com>