BHV-11383 : modify _oCurrent property's sync time

### Problem that cause the issue
_oCurrent is not synced exactly with 'current spotted control'

### Analysis
After https://github.com/enyojs/spotlight/pull/135 PR, 'spot' function check _oCurrent and oControl and return 'true' immediatly if it is same.
However, currently _oCurrent is not synced exactly with 'current spotted control'
Somtimes, there is no spotted control, but _oCurrent indicates exCurrentControl.
So, update _oCurrent property in Spotlight.js to sync accurately with current spotlight control.

Enyo-DCO-1.1-Signed-off-by: Sungbae Cho sb.cho@lge.com