Fix bad refs in Warming.py

[elehmer]

Description of PR

This PR is a quick fix for bad function ref and unused function imports in Warming.py

Summary of changes and related issue

[What's changed in this PR?]

Relevant motivation and context

[Why did you change this and what applicable context is needed to understand why this change is needed?]

Type of change

• [ x ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Definition of Done Checklist

Practical

• [ ] 80% unit test coverage
• [ ] Documentation
  • [ ] All functions/adjusted functions documented in the readthedocs.
  • [ ] Documentation is pushed
• [ ] Complex code commented
• [ ] Naming conventions followed
  • [ ] Helper functions hidden with _ before the name
• [ ] Context of function is clearly provided
  • [ ] Intent of function is provided
  • [ ] How to test, so that it is not siloed on scientists and anyone can review
  • [ ] Appropriate manual testing was completed
• [ ] Any notebooks known to utilize the affected functions are still working
• [ ] Linting completed and resolved

Conceptual

• [ ] Doesn't replicate existing functionality
• [ ] Aligns with general coding standard of existing functions
• [ ] Matches desired functionality from users/scientists