fix: remove unused parameters in co_occurence

[selmanozleyen]

fixes: #1110 and #1048 .

n_splits usage was removed here 32789ae

[flying-sheep]

this will break code that uses these parameters – sure they are unused, but you could warn first that they do nothing and will be removed, and then remove them later,

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.36%. Comparing base (6dc2a91) to head (7de00ca).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1121   +/-   ##
=======================================
  Coverage   66.36%   66.36%           
=======================================
  Files          44       44           
  Lines        7132     7132           
  Branches     1212     1212           
=======================================
  Hits         4733     4733           
  Misses       1923     1923           
  Partials      476      476           

Files with missing lines	Coverage Δ
src/squidpy/gr/_ppatterns.py	77.92% <100.00%> (ø)

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