BHV-5887: Prevent Spotlight from highlighting controls during panel transition.

Issue
-------
Controls can be spotted during a panel transition, which can trigger unnecessary repaints.

Fix
----
We utilize the `Muter` in `Spotlight` to mute Spotlight events during panel transitions.

Notes
--------
This PR is dependent on a Spotlight PR: https://github.com/enyojs/spotlight/pull/126

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>