Fix Normalize redundant loop bug

[hejm37]

#120

[codecov]

Codecov Report

Merging #121 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   82.45%   82.44%   -0.01%     
==========================================
  Files         143      143              
  Lines        6610     6609       -1     
  Branches      980      979       -1     
==========================================
- Hits         5450     5449       -1     
  Misses       1062     1062              
  Partials       98       98              

Flag	Coverage Δ
#unittests	82.44% <100.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
mmedit/datasets/pipelines/normalization.py	100.00% <100.00%> (ø)

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