LP#1743262 CC external payment requires app. code

LP#1743262 CC external payment requires app. code

1. Indicate in the CC form that the approval_code field is required,
   styled consistently with the patron edit app.

2. Prevent the form dialog from closing via Submit when no approval code
   is set.

3. Handle payment failures better by preventing the post-API code from
   running (i.e. receipt printing) when the API fails.

To test
-------
[1] In the web staff client, attempt to record an externally-supplied
    credit card payment without specifying an approval code. Note that
    an alert message is presented.
[2] Apply the patch and repeat step 1. This time, the approval code is
    displayed as a required field and the dialog cannot be submitted
    until one is specified.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Terran McCanna <tmccanna@georgialibraries.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>