fix: remove dead code - ethhash_keccak256_32

[pdobacz]

unused specialization of our favorite hash function

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.83%. Comparing base (1d137a1) to head (d76f54f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1345      +/-   ##
==========================================
- Coverage   87.32%   84.83%   -2.50%     
==========================================
  Files         169      169              
  Lines       25047    20356    -4691     
  Branches     4121     4121              
==========================================
- Hits        21873    17268    -4605     
+ Misses        524      438      -86     
  Partials     2650     2650              

Flag	Coverage Δ
eest-develop	79.81% <ø> (-0.82%)	⬇️
eest-develop-gmp	14.67% <ø> (-1.46%)	⬇️
eest-legacy	10.11% <ø> (-1.07%)	⬇️
eest-legacy-silkpre	16.21% <ø> (-1.40%)	⬇️
evmone-unittests	81.24% <ø> (-2.53%)	⬇️

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Components	Coverage Δ
core	92.71% <ø> (-1.08%)	⬇️
tooling	84.69% <ø> (-3.33%)	⬇️
tests	81.42% <ø> (-2.75%)	⬇️

Files with missing lines	Coverage Δ
lib/evmone_precompiles/keccak.c	99.11% <ø> (+2.60%)	⬆️
lib/evmone_precompiles/keccak.hpp	100.00% <ø> (+50.00%)	⬆️

... and 160 files with indirect coverage changes

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