Hotfix physics datapath

[oelbert]

Description
This PR fixes the path to the physics test data in the makefile

How Has This Been Tested?
Test data has been pulled successfully

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• Targeted model, if this change was triggered by a model need/shortcoming

[fmalatino]

lgtm