fix: plca update logic

[yoyolicoris]

fix #14

[codecov-io]

Codecov Report

Merging #15 (2eb1539) into master (dce05b2) will increase coverage by 0.40%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #15      +/-   ##
==========================================
+ Coverage   94.23%   94.63%   +0.40%     
==========================================
  Files           7        7              
  Lines         659      671      +12     
==========================================
+ Hits          621      635      +14     
+ Misses         38       36       -2     

Flag	Coverage Δ
unittests	94.63% <100.00%> (+0.40%)	⬆️

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Impacted Files	Coverage Δ
torchnmf/trainer.py	93.63% <ø> (ø)
torchnmf/metrics.py	100.00% <100.00%> (+8.69%)	⬆️
torchnmf/plca.py	96.61% <100.00%> (ø)

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[yoyolicoris]

mostly fixed, should be good to go