Use dojoClick=true for all clickable things in the Calendar,
including the drop down, for responsiveness and to fix #18140.

Still leaves the underlying problems that dijit/popup is calling
preventDefault() on the touchend event, thus canceling the click event,
and that (canceling out the first problem), dojo/touch is ignoring the
call to preventDefault().

Fixes #18140, refs #18150.
Use dojoClick=true for all popups, to make sure they get click events on iOS,
even though we are calling evt.preventDefault().  Avoids potential problems on iOS,
although it probably doesn't affect dijit's widgets directly because they already use
dojo/touch.

Refs #18150 and tangentially refs #18140.