Update _copykat.py

[josephreplogle]

Update to include cell_line and window_size parameters

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 55.94%. Comparing base (527284c) to head (a529919).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/infercnvpy/tl/_copykat.py	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
- Coverage   56.20%   55.94%   -0.27%     
==========================================
  Files          13       13              
  Lines         427      429       +2     
==========================================
  Hits          240      240              
- Misses        187      189       +2     

Files with missing lines	Coverage Δ
src/infercnvpy/tl/_copykat.py	13.79% <0.00%> (-0.50%)	⬇️

[grst]

LGTM, thanks!