fix codefactor issues

[sduquemesa]

Context: Codefactor is showing 25+ new issues on PR #441

Description of the Change: Applies suggested changes from codefactor

Benefits: Zero codefactor warnings, allows merge of PR #441

Possible Drawbacks: None

Related GitHub Issues: None

[codecov[bot]]

Codecov Report

Merging #638 (d8ac13e) into master (0e06dc6) will decrease coverage by 36.03%. The diff coverage is 36.84%.

@@             Coverage Diff             @@
##           master     #638       +/-   ##
===========================================
- Coverage   98.55%   62.51%   -36.04%     
===========================================
  Files          77       77               
  Lines        8989     8985        -4     
===========================================
- Hits         8859     5617     -3242     
- Misses        130     3368     +3238     

Impacted Files	Coverage Δ
strawberryfields/api/devicespec.py	46.87% <0.00%> (-48.44%)	:arrow_down:
strawberryfields/decompositions.py	13.89% <0.00%> (-85.88%)	:arrow_down:
...trawberryfields/backends/bosonicbackend/backend.py	100.00% <100.00%> (ø)
strawberryfields/backends/states.py	76.81% <100.00%> (-23.03%)	:arrow_down:
strawberryfields/backends/tfbackend/__init__.py	60.00% <100.00%> (-13.34%)	:arrow_down:
strawberryfields/backends/tfbackend/circuit.py	96.40% <100.00%> (+0.38%)	:arrow_up:
strawberryfields/engine.py	70.17% <100.00%> (-26.32%)	:arrow_down:
strawberryfields/apps/subgraph.py	10.11% <0.00%> (-89.89%)	:arrow_down:
strawberryfields/apps/clique.py	10.67% <0.00%> (-89.33%)	:arrow_down:
strawberryfields/apps/qchem/dynamics.py	12.65% <0.00%> (-87.35%)	:arrow_down:
... and 44 more

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[sduquemesa]

I'm merging this branch directly with catstate_real used on PR #441 and closing this PR. No need to merge to master.