Fixed forwarding bug in simplify for window stmts

[skeqiqevian]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06% 🎉

Comparison is base (9c73323) 86.39% compared to head (f724754) 86.45%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #482      +/-   ##
==========================================
+ Coverage   86.39%   86.45%   +0.06%     
==========================================
  Files          78       78              
  Lines       17949    17951       +2     
==========================================
+ Hits        15507    15520      +13     
+ Misses       2442     2431      -11     

Files Changed	Coverage Δ
src/exo/LoopIR_scheduling.py	90.90% <100.00%> (+0.36%)	⬆️
tests/test_schedules.py	99.37% <100.00%> (+<0.01%)	⬆️

... and 1 file with indirect coverage changes

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