Fix physics_tend imports

[georgemccabe]

Pull Request Testing

• Describe testing already performed for these changes:
  

Ran METplus use case METplus/parm/use_cases/model_applications/short_range/UserScript_fcstFV3_fcstOnly_PhysicsTendency_Planview.conf using branch of METplotpy and confirmed that the use case runs without issue.

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

Review changes. Optionally run other 2 FV3 use cases using the change to confirm that it works as expected.

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes]

• Do these changes include sufficient testing updates? [Yes]

• Will this PR result in changes to the test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Do these changes introduce new SonarQube findings? [No]
  
  If yes, please describe:

• Please complete this pull request review by 1/27/2025.
  

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[ahijevyc]

I tested in my environment and it works. Great catch!

[bikegeek]

also works in Dave A's environment