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>
Hi @dmikey, do we know why `scrollToIndex` no longer behaves the way it used to? Curious to find out as this can affect other code using this method.