Removes obsolete independent_bn_bias argument

[MaxFBurg]

Addressing #219

[codecov]

Codecov Report

Attention: Patch coverage is 20.00000% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 7.52%. Comparing base (5994426) to head (e354212).

Files	Patch %	Lines
neuralpredictors/layers/cores/conv3d.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #221      +/-   ##
========================================
+ Coverage   7.50%   7.52%   +0.02%     
========================================
  Files         58      58              
  Lines       5982    5965      -17     
  Branches    1018    1012       -6     
========================================
  Hits         449     449              
+ Misses      5496    5479      -17     
  Partials      37      37              

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[pollytur]

I would keep it on pause while the examples in the notebooks folder are not updated because currently there is nnsysident there and it actually uses this argument

[pollytur]

After discussing we decided to remove the example later and in the repositories, who depend on this parameter, they might specify the commit to inherit. There is the independent_bn_bias in the 3d core, but this should be refactored anyway

[MaxFBurg]

Merge #221 226 before merging this PR to avoid merge conflicts

[pollytur]

@MaxFBurg I guess its now black and should be fine after
Thanks for solving the merge conflict!