[FIX] purchase: confirm receipt date if needed

Before this commit, There would be Traceback (AttributeError: 'bool' object has no attribute 'date')
on `Confirm Receipt Date` If order has no `Receipt Date`.

Now, Button `Confirm Receipt Date` will be hidden if there is not `Receipt Date` to confirm.

Closed #60222

closes odoo/odoo#60659

Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>