AUI-1672 Scheduler navigation date for week view is not formatted correctly

Hey @jonmak08,

Here is an update for https://issues.liferay.com/browse/AUI-1672.

The date is not formatted correctly because we pass the wrong date to the method isMonthOverlapWeek. If you look at aui-datatype.js, that method takes the week begin date as its argument, which should be the startDate variable.

Let me know if you have any questions. Thanks!