fix: resolve material map scripts for Acts 39

[wdconinc]

Briefly, what does this PR introduce?

This PR addresses changes in the material map scripts for Acts 39.

What kind of change does this PR introduce?

• [x] Bug fix (issue: Acts 39 upgrade broke material map scripts)
• [ ] New feature (issue #__)
• [ ] Documentation update
• [ ] Other: __

Please check if this PR fulfills the following:

• [ ] Tests for the changes have been added
• [ ] Documentation has been added / updated
• [ ] Changes have been communicated to collaborators

Does this PR introduce breaking changes? What changes might users need to make to their code?

No.

Does this PR change default behavior?

No.

[wdconinc]

Material map validation failure bisected to https://github.com/acts-project/acts/pull/3449