Ref262 task277 fitting flake8 fixes
Fixes various flake 8 issues found in the src/fitting package
https://code.ornl.gov/sns-hfir-scse/reflectometry/reflectometry/-/issues/277
Edited by Walsh, Michael
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Fixes various flake 8 issues found in the src/fitting package
https://code.ornl.gov/sns-hfir-scse/reflectometry/reflectometry/-/issues/277