LP 1708728 - Fix Stripe penny errors introduced by perl int() function

LP 1708728 - Fix Stripe penny errors introduced by perl int() function

Fixes the issue where payment amounts sent to Stripe can be one cent less
than the actual Evergreen payment due to use of the perl int() function.

To test
-------
A Stripe account is required to view transactions on the Stripe side.
To enable test payments, Stripe testing API keys need to be entered
in the Evergreen ou settings:

credit.processor.stripe.pubkey
credit.processor.stripe.secretkey

- Add a bill to a patron record with the following amounts: $8.20
- Login to the opac as the patron and pay the bill.
- View the transaction on the Stripe side and see that it is one cent
  less than the paid bill in Evergreen.
- Apply the patch.
- Repeat the steps above.

- On the Stripe side, see that the Stripe amount and Evergreen amount
  now match.

Signed-off-by: Michele Morgan <mmorgan@noblenet.org>
Signed-off-by: Dan Pearl <dpearl@cwmars.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>