Fix compatibility with VTK 9.3.0

[mwestphal]

Description

Fixing issues that prevent building VisIt against VTK 9.3.0

Type of change

• [x] Bug fix
• [ ] New feature~~
• [ ] Documentation update~~
• [ ] Other~~

How Has This Been Tested?

Local build against VTK 9.3.0

Reminders:

• Please follow the style guidelines of this project.
• Please perform a self-review of your code before submitting a PR and asking others to review it.
• Please assign reviewers (see VisIt's PR procedures for more information).

Checklist:

• [x] I have commented my code where applicable.~~
• [ ] I have updated the release notes.~~
• [ ] I have made corresponding changes to the documentation.~~
• [ ] I have added debugging support to my changes.~~
• [ ] I have added tests that prove my fix is effective or that my feature works.~~
• [ ] I have confirmed new and existing unit tests pass locally with my changes.~~
• [ ] I have added new baselines for any new tests to the repo.~~
• [x] I have NOT made any changes to protocol or public interfaces in an RC branch.~~