Additional NRL site config updates after pulling in spack/spack-packages develop

[climbfuji]

Description

This PR contains two small bug fixes for the Blueback and Narwhal site configs that are required to build the different environments after the update of spack and spack-packages from develop last month.

Dependencies

n/a

Issues addressed

n/a

Applications affected

n/a

Systems affected

Blueback, Narwhal

Testing

• CI: Note whether the automatic tests (GitHub actions tests that run automatically for every commit) pass or not
  • GitHub actions CI tests pass
  • GitHub actions CI tests do not pass (provide explanation)
  • GitHub actions CI tests skipped these files aren't used by GitHub Actions
• New tests added: List and describe any new tests added to GitHub actions
  • ...
• Additional testing: Add information on any additional tests conducted
  • Built all spack-stack environments with all supported compilers on NRL's Atlantis, Blueback, Narwhal, Nautilus

Checklist

• This PR addresses one issue/problem/enhancement or has a very good reason for not doing so.
• These changes have been tested on the affected systems and applications.
• All dependency PRs/issues have been resolved and this PR can be merged.
• All necessary updates to the documentation (spack-stack wiki) will be made when this PR is merged