fix duplicate rownames introduced in cellphonedb v5

[zktuong]

related to zktuong/ktplots#89

[codecov]

Codecov Report

Merging #48 (27ea679) into master (797548d) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #48      +/-   ##
==========================================
- Coverage   97.25%   97.23%   -0.02%     
==========================================
  Files           7        7              
  Lines         655      652       -3     
==========================================
- Hits          637      634       -3     
  Misses         18       18              

Flag	Coverage Δ
unittests	97.23% <100.00%> (-0.02%)	⬇️

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Files	Coverage Δ
ktplotspy/plot/plot_cpdb.py	94.11% <100.00%> (+0.07%)	⬆️
ktplotspy/plot/plot_cpdb_chord.py	100.00% <100.00%> (ø)
ktplotspy/utils/support.py	100.00% <100.00%> (ø)

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