moved sampler from scrollTo to focusOn to correct spotlight behavior

Issue: Moon DataList Sample - When updating `scrollToIndex`, and then attempting to use spotlight, would cause the list to scroll to a different nearest neighbor. 

Fix: Switched the Sample to use `focusOnIndex` , which also calls `scrollToIndex`, and ensures that the index is spotted.

Also cleaned up some whitespace.

Enyo-DCO-1.1-Signed-off-by: Derek Anderson <derek.anderson@lge.com>
Yep, I had everything checking out latest master (2.5.1-pre.9) and then checked-out 2.5.1-pre.8 for moonstone. When you set the index, and then 5-way up to collapse the header, followed by pressing 5-way down to focus on the list, notice that the highlighted button's index matches the index you had input earlier.