add workaround patch of enum with colon failing CWL validation [URI variant]

[fmigneault]

• relates to Enum with colon symbols cause URI parsing error  common-workflow-language/cwltool#2071
• closes add workaround patch of enum with colon failing CWL validation #763
  (alternative, simpler CWL without JS injection)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.36%. Comparing base (bc032fa) to head (c12bc63).
Report is 6 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #764   +/-   ##
=======================================
  Coverage   87.36%   87.36%           
=======================================
  Files          80       80           
  Lines       20676    20682    +6     
  Branches     2816     2818    +2     
=======================================
+ Hits        18063    18069    +6     
  Misses       1868     1868           
  Partials      745      745           

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