fix path in test

[braingram]

Closes #714

See issue for description of bug. The test was splitting on "rad/resources" instead of "rad/latest" which this PR fixes.

Confirmed to fix test when run with the rad clone at a path that includes a "-" in the parent path contents.

No changelog or regtests as this is only a unit test change.

Tasks

• Update or add relevant rad tests.
• Update relevant docstrings and / or docs/ page.
• Does this PR change any schema files?
  • Schema changes were discussed at RAD Review Board meeting.
• Does this PR change any API used downstream? (If not, label with no-changelog-entry-needed.)
  • Write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types).
  • Start a romancal regression test (https://github.com/spacetelescope/RegressionTests/actions/workflows/romancal.yml) with this branch installed ("git+https://github.com/<fork>/rad@<branch>").
  • Update relevant roman_datamodels utilities and tests.

News fragment change types:

• changes/<PR#>.feature.rst: new feature
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.doc.rst: documentation change
• changes/<PR#>.removal.rst: deprecation or removal of public API
• changes/<PR#>.misc.rst: infrastructure or miscellaneous change

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.59%. Comparing base (c85d4f5) to head (cdc2361).
⚠️ Report is 136 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #730   +/-   ##
=======================================
  Coverage   97.59%   97.59%           
=======================================
  Files           8        8           
  Lines         747      747           
=======================================
  Hits          729      729           
  Misses         18       18           

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