Fix cleanup for non external io method

[t-young31]

Resolves #178

[codecov]

Codecov Report

Merging #179 (aae9530) into v1.3.1 (528281e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           v1.3.1     #179      +/-   ##
==========================================
+ Coverage   96.94%   96.95%   +0.01%     
==========================================
  Files         194      194              
  Lines       19811    19833      +22     
==========================================
+ Hits        19205    19230      +25     
+ Misses        606      603       -3     

Flag	Coverage Δ
unittests	96.95% <100.00%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
autode/calculations/executors.py	98.35% <100.00%> (-0.40%)	⬇️
tests/conftest.py	100.00% <100.00%> (ø)
tests/test_calculation.py	97.06% <100.00%> (+0.03%)	⬆️
tests/test_hessian.py	98.51% <100.00%> (+<0.01%)	⬆️
tests/test_wrappers/test_nwchem.py	100.00% <100.00%> (ø)
tests/test_wrappers/test_xtb.py	99.42% <100.00%> (+0.04%)	⬆️

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