GF-59844: Revert onScrollStop changes made in GF-59604

Reverting the fix to http://jira2.lgsvl.com/browse/GF-59604, which broke TranslateScrollStrategy.  TranslateScrollStrategy relies on onScrollStart and onScrollStop events being matched, and the change in https://github.com/enyojs/enyo/pull/646 resulted in the events being unmatched.  We'll need to re-think the original issue's solution.