fix abs_deriv edge effects

[braingram]

Resolves JP-nnnn

Regression tests running at: https://plwishmaster.stsci.edu:8081/job/RT/job/JWST-Developers-Pull-Requests/1595/

Closes #

This PR addresses ...

Checklist for PR authors (skip items if you don't have permissions or they are not applicable)

• [ ] added entry in CHANGES.rst within the relevant release section
• [ ] updated or added relevant tests
• [ ] updated relevant documentation
• [ ] added relevant milestone
• [ ] added relevant label(s)
• [ ] ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR
• [ ] All comments are resolved
• [ ] Make sure the JIRA ticket is resolved properly

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 59.56%. Comparing base (69a10bc) to head (8ff0e44).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8635 +/- ## ========================================== + Coverage 59.52% 59.56% +0.04% ========================================== Files 391 391 Lines 39321 39280 -41 ========================================== - Hits 23405 23397 -8 + Misses 15916 15883 -33 ```

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