AL-852: GWCS inverse transform should respect its bounding box

[nden]

GWCS has a bug where the inverse transform does not respect the bounding_box. This leads to unexpected results that affect other applications. The GWCS bud is fixed in https://github.com/spacetelescope/gwcs/pull/498 This PR fixes problems in jwst which surfaced when the bug was fixed.

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