couple of probelms, you changed the paypal button element type from
input type"submit"
to button type="submit"
Since you wan to trigger different actions based on which button is pressed, you need to use the input type, the button type is generic and cannot be referenced by name.
I changed it back to an input type.
on the cart_confrim page, it was triggering validation of the zip code element which was removed, so i commented that line out.
on the confirm page, i changed the paypal trigger to:
if (!isset($_GET["plugin_file"]) && !empty($_POST) && isset($_POST["CheckoutWizard_submit"])) {