Adds hidden radio on shipping and billing options on Jumpseller

<script>
$(document).ready(function(){
$("#payments_options ul").append('<li><input class="default_radio" type="radio"  checked="checked" name="order[payment_method]" value="" class="radiobox" hidden></li>');
$("#shipping_options ul").append('<li><input class="default_radio" type="radio"  checked="checked" name="order[shipping_method]" value=""  class="radiobox" hidden></li>');
});

$("#checkout").submit(function(evt){
if( $("#payments_options input:checked").val() == "" || $("#shipping_options input:checked").val() == "" ){
evt.preventDefault();
alert({% t "Select Payment and Sipping Methods" %} );
}
});
</script>