Fix convert_cwl_type

[simleo]

Fixes #32.

Without this PR, convert_cwl_type could not convert arrays of enums.

The sample RO bundle given in #32 still does not convert because ExpressionTool is not supported yet.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5d481fc) 97.13% compared to head (66a6afc) 97.14%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #37   +/-   ##
=======================================
  Coverage   97.13%   97.14%           
=======================================
  Files          11       11           
  Lines        1711     1716    +5     
=======================================
+ Hits         1662     1667    +5     
  Misses         49       49           

Impacted Files	Coverage Δ
src/runcrate/convert.py	97.54% <100.00%> (ø)
tests/test_cwlprov_crate_builder.py	99.86% <100.00%> (+<0.01%)	⬆️

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