Fix `choimatrix(circuit)`

[codecov-commenter]

Codecov Report

Merging #239 (d2e9df9) into master (00f47b9) will increase coverage by 1.61%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #239      +/-   ##
==========================================
+ Coverage   80.30%   81.92%   +1.61%     
==========================================
  Files          21       21              
  Lines        2326     2025     -301     
==========================================
- Hits         1868     1659     -209     
+ Misses        458      366      -92     

Impacted Files	Coverage Δ
src/circuits/runcircuit.jl	94.93% <ø> (+6.93%)	:arrow_up:
src/itensor.jl	35.71% <0.00%> (-10.00%)	:arrow_down:
src/measurements.jl	30.37% <0.00%> (-2.26%)	:arrow_down:
src/utils.jl	67.56% <0.00%> (-1.04%)	:arrow_down:
src/distances.jl	92.30% <0.00%> (-1.03%)	:arrow_down:
src/inputoutput.jl	35.78% <0.00%> (-0.82%)	:arrow_down:
src/circuits/noise.jl	91.89% <0.00%> (-0.52%)	:arrow_down:
src/randomstates.jl	86.12% <0.00%> (-0.41%)	:arrow_down:
src/circuits/getsamples.jl	88.14% <0.00%> (-0.39%)	:arrow_down:
src/array.jl	96.82% <0.00%> (-0.24%)	:arrow_down:
... and 11 more

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