Fix --print-targets to pass inherited reqs.

[mr-c]

Inspired by https://github.com/douglowe/cwl-mutation-example ; thanks @douglowe!

[codecov]

Codecov Report

Merging #1580 (d3d4d0d) into main (f02df5a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1580      +/-   ##
==========================================
+ Coverage   66.11%   66.13%   +0.01%     
==========================================
  Files          91       91              
  Lines       16321    16329       +8     
  Branches     4344     4344              
==========================================
+ Hits        10791    10799       +8     
- Misses       4380     4382       +2     
+ Partials     1150     1148       -2     

Impacted Files	Coverage Δ
cwltool/main.py	67.52% <100.00%> (+0.58%)	⬆️
main.py	31.52% <0.00%> (-0.04%)	⬇️

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