chore: remove a dead code path in build/generate-style-spec.ts

[CommanderStorm]

This code is the same as what the default branch does

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.70%. Comparing base (2e757d5) to head (f6fac0a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1393   +/-   ##
=======================================
  Coverage   93.70%   93.70%           
=======================================
  Files         111      111           
  Lines        4387     4387           
  Branches     1389     1389           
=======================================
  Hits         4111     4111           
  Misses        276      276           

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[github-actions]

Size Change: 0 B

Total Size: 134 kB

ℹ️ View Unchanged

Filename	Size
dist/index.cjs	67.5 kB
dist/index.mjs	66.4 kB

_{compressed-size-action}

[HarelM]

Thanks!