HTML Widgets; MsgBoxConfirmList; Dialog height now sized to better accomodate a heading

The widget.UI.MsgBoxConfirmList method now produces a form that is sized better to accomodate a heading.

For example, the following code produced a vertical scrollbar in earlier versions:

widget.UI.MsgBoxConfirmList("To continue, please approve the following:",
  ["This Loan Account does not allow partial early payments.",
   "Credit Card Number is not recognised.",
   "Credit Card has EXPIRED."],
   {icon:"warning", heading: "Additional Confirmation"});