Bug 1030430 - updated call log accessibility to work as a listbox.

@Rik: When the call log is in edit mode and there's no screen reader the tap on the logItem will actually land on a label(checkbox). With the screen reader it will still land on the logItem. So logItem.dataset.phoneNumber in edit mode will only be there when the screen reader is on. I need to update the comment though.
Deleting seems to work well for both with and without the screen reader.