Fix unused variables in differential photometry

[mwcraig]

For all of these issues, first delete the appropriate line in pyproject.toml that excludes the subpackage from checks. for differential_photometry you would delete this line:

"stellarphot/differential_photometry/*" = ["F"]

After that, run ruff either with tox -e lint or ruff .. The errors you get should be the ones -- fix them! If it is an unused function argument make sure to search the project for calls to that function to update the arguments there too.

• stellarphot/differential_photometry/tests/test_aij_rel_fluxes.py:75:5: F841 Local variable photom is assigned to but never used