Small issue in cal/iCalendar.js

Hi!

I just found a small error in iCalendar.js:

        [_P("action", 1, true), _P("attach", 1, true), _P("trigger", 1, true),
        [_P("duration", 1), _P("repeat", 1)],
        _P("description", 1)],
];

The last comma behind the closing "];" is wrong. It should be:

        [_P("action", 1, true), _P("attach", 1, true), _P("trigger", 1, true),
        [_P("duration", 1), _P("repeat", 1)],
        _P("description", 1)]
];

Cheers,

Sebastian