Method _update_modal should use namespaced click event

[hrasekj]

For some reason method _update_modal is unbinding click event every time its called, even when modal option is false.

It have logic, because define click event later on for showing the modal. But when i want custom click event i struggle here. Would be nice to use namespaced callback or just move unbind call under that if statement.

$('a[data-event-id]', this.context).unbind('click.calendar.modal');

...

$('a[data-event-id]', this.context).on('click.calendar.modal', ...

Or is there reason not to use namespace here?