Removing non existent items from params to avoid bug when clicking on remove multiple times or when clicking on multiple remove buttons

Fixes #5304
Closes #5305
Simple fix for payment source.

Steps to reproduce the issue:

1. Add an order through the admin interface
2. Attempt to pay via cheque for a user who has a credit card number
stored in their profile.
3. Submit the form

This will 500, because params[:card] is set from the form on the initial
page for the radio button from the credit card profiles.

This is a simple, though incomplete fix for the issue. A proper fix
would be to change the form so that params[:card] is qualified by the
payment_method which it belongs.

There are also likely issues with multiple payment methods which support
profiles, as there is likely to be confusion between them. This should
suffice for now.

Fixes #5209
keep the simple_current_order simple :)