HOTFIX to slitless pixflat

[debora-pe]

Set slit_illum_finecorr = False when computing the slitless pixelflat

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 38.07%. Comparing base (2b53647) to head (8fe916a).

Files with missing lines	Patch %	Lines
pypeit/flatfield.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1863      +/-   ##
===========================================
- Coverage    38.07%   38.07%   -0.01%     
===========================================
  Files          211      211              
  Lines        49051    49052       +1     
===========================================
  Hits         18675    18675              
- Misses       30376    30377       +1     

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[rcooke-ast]

Good call 👍