JP-1887: ramp_fit PEP8 cleanup

[kmacdonald-stsci]

Made style changes to ramp_fit.py based on adding E2 to the flake8 configuration, as well as using autopep8 and pylint.

Addresses #5701 / JP-1887

[jdavies-st]

LGTM!

[codecov]

Codecov Report

Merging #5803 (801a0aa) into master (8dd1f43) will increase coverage by 0.14%.
The diff coverage is 83.57%.

@@            Coverage Diff             @@
##           master    #5803      +/-   ##
==========================================
+ Coverage   76.63%   76.77%   +0.14%     
==========================================
  Files         406      406              
  Lines       36243    36688     +445     
==========================================
+ Hits        27774    28169     +395     
- Misses       8469     8519      +50     

Flag	Coverage Δ		*Carryforward flag
nightly	76.63% <80.23%> (ø)		Carriedforward from 8dd1f43
unit	54.61% <85.83%> (?)

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
jwst/ramp_fitting/ramp_fit.py	82.23% <83.57%> (+2.71%)	⬆️
jwst/associations/asn_edit.py	66.66% <0.00%> (-0.75%)	⬇️
jwst/associations/lib/process_list.py	73.49% <0.00%> (-0.59%)	⬇️
jwst/fits_generator/template.py	16.98% <0.00%> (-0.27%)	⬇️
jwst/timeconversion/time_conversion.py	10.96% <0.00%> (-0.08%)	⬇️
jwst/datamodels/make_header.py	91.38% <0.00%> (+0.02%)	⬆️
jwst/associations/lib/product_utils.py	94.82% <0.00%> (+0.09%)	⬆️
jwst/regtest/conftest.py	90.96% <0.00%> (+1.20%)	⬆️
jwst/tso_photometry/tso_photometry_step.py	77.41% <0.00%> (+1.61%)	⬆️

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