Custom date formats in Views not supported

In the event_views sub-module, the start time and end time fields don't enable the "options" field. That means that while you can set the date format to "As Custom Date", there's no way to specify what that custom date format is. It's there for filters, but not for fields.

This patch (against the 4.7 branch) simply enables the option field for both start time and end time, which means everything now works as it should. I suspect HEAD will need this applied as well, but it's just 2 lines so I figure the maintainer can handle that part himself. :-)