fix: correct CallIndirect tag from FnCall to DataflowChild

[ss2165]

Closes #2005

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.71%. Comparing base (6ed4ecf) to head (6b3ab4a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2006   +/-   ##
=======================================
  Coverage   83.71%   83.71%           
=======================================
  Files         209      209           
  Lines       39192    39215   +23     
  Branches    35863    35886   +23     
=======================================
+ Hits        32808    32830   +22     
- Misses       4540     4541    +1     
  Partials     1844     1844           

Flag	Coverage Δ
python	92.03% <ø> (ø)
rust	82.94% <100.00%> (+<0.01%)	⬆️

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[doug-q]

Will approve once you've improved the test case.

I considered whether it's worth adding tags so that call/callindirect share a "call" tag, but it doesn't seem like it. CallIndirect doesn't have to be builtin anymore I don't think?

[doug-q]

Awesome, thank you.