Replace remaining tabs with spaces in stacks.js.

[aalexand]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.34%. Comparing base (0ed6a68) to head (584eb9f).
Report is 37 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #898      +/-   ##
==========================================
+ Coverage   66.86%   67.34%   +0.48%     
==========================================
  Files          44       44              
  Lines        9824     9825       +1     
==========================================
+ Hits         6569     6617      +48     
+ Misses       2794     2761      -33     
+ Partials      461      447      -14     

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