Remove unnecessary if-checks in MoonScrollStrategy.

The `scrollMathScroll` method is doing more work than necessary. The `enableDisablePageControls` method already does a `this.hovering` check, and fires the `hidePageControls` method if it's not hovering. This change flattens this method and removes unnecessary redundancy.

This is non-urgent and not based on an issue-ticket; just a minor optimization.
Enyo-DCO-1.1-Signed-off-by: Blake Stephens <blake.stephens@lge.com>