Noncontextual check fix

[AlexisRalli]

-fixed bug in is_noncontextual in PauliwordOp

[codecov-commenter]

Codecov Report

Patch coverage: 67.56% and project coverage change: -0.16% ⚠️

Comparison is base (2f98191) 77.33% compared to head (c9f6bc0) 77.18%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
- Coverage   77.33%   77.18%   -0.16%     
==========================================
  Files          33       33              
  Lines        3750     3826      +76     
==========================================
+ Hits         2900     2953      +53     
- Misses        850      873      +23     

Files Changed	Coverage Δ
symmer/operators/noncontextual_op.py	75.53% <37.93%> (-7.40%)	⬇️
symmer/operators/anticommuting_op.py	82.22% <100.00%> (+0.13%)	⬆️
symmer/operators/base.py	65.52% <100.00%> (+1.11%)	⬆️
symmer/operators/utils.py	77.58% <100.00%> (-0.07%)	⬇️
symmer/utils.py	78.91% <100.00%> (+7.87%)	⬆️
tests/test_operators/test_base.py	99.65% <100.00%> (+<0.01%)	⬆️

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